diff --git a/src-tauri/src/git.rs b/src-tauri/src/git.rs
index d90a967..3ac8c24 100644
--- a/src-tauri/src/git.rs
+++ b/src-tauri/src/git.rs
@@ -131,6 +131,26 @@ pub struct GitCommit {
     pub has_note: bool,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+pub struct BisectCommit {
+    pub hash: String,
+    pub short_hash: String,
+    pub summary: String,
+    pub author_name: String,
+    pub date: String,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+pub struct BisectState {
+    pub active: bool,
+    pub finished: bool,
+    pub current: Option<BisectCommit>,
+    pub culprit: Option<BisectCommit>,
+    pub remaining_revisions: Option<u32>,
+    pub remaining_steps: Option<u32>,
+    pub message: String,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
 pub struct GitCommitFile {
     pub path: String,
@@ -3377,6 +3397,181 @@ pub fn restore_reflog_entry(
     status_for_repo(&repo)
 }
 
+fn bisect_in_progress(repo: &Path) -> Result<bool, String> {
+    Ok(git_dir_for_repo(repo)?.join("BISECT_START").is_file())
+}
+
+fn bisect_commit_for_ref(repo: &Path, revision: &str) -> Result<BisectCommit, String> {
+    let output = run_git(
+        repo,
+        [
+            "log",
+            "-1",
+            "--format=%H%x1f%h%x1f%s%x1f%an%x1f%aI",
+            revision,
+        ],
+    )?;
+    let text = String::from_utf8_lossy(&output);
+    let fields = text.trim().splitn(5, '\x1f').collect::<Vec<_>>();
+    if fields.len() != 5 {
+        return Err("Git returned an unexpected bisect commit record.".to_string());
+    }
+    Ok(BisectCommit {
+        hash: fields[0].to_string(),
+        short_hash: fields[1].to_string(),
+        summary: fields[2].to_string(),
+        author_name: fields[3].to_string(),
+        date: fields[4].to_string(),
+    })
+}
+
+fn parse_bisect_progress(message: &str) -> (Option<u32>, Option<u32>) {
+    let Some(line) = message.lines().find(|line| line.contains("Bisecting:")) else {
+        return (None, None);
+    };
+    let revisions = line.split("Bisecting:").nth(1).and_then(|tail| {
+        tail.split_whitespace()
+            .find_map(|word| word.parse::<u32>().ok())
+    });
+    let steps = line.split("roughly").nth(1).and_then(|tail| {
+        tail.split_whitespace()
+            .find_map(|word| word.parse::<u32>().ok())
+    });
+    (revisions, steps)
+}
+
+fn parse_bisect_culprit(message: &str) -> Option<String> {
+    for line in message.lines() {
+        if line.contains(" is the first ") && line.contains("bad") && line.contains(" commit") {
+            return line.split_whitespace().next().map(ToString::to_string);
+        }
+        if line.contains("first") && line.contains("bad") && line.contains("commit:") {
+            let start = line.find('[')? + 1;
+            let end = line[start..].find(']')? + start;
+            return Some(line[start..end].to_string());
+        }
+    }
+    None
+}
+
+fn bisect_state_for_repo(repo: &Path, message: String) -> Result<BisectState, String> {
+    let active = bisect_in_progress(repo)?;
+    if !active {
+        return Ok(BisectState {
+            active: false,
+            finished: false,
+            current: None,
+            culprit: None,
+            remaining_revisions: None,
+            remaining_steps: None,
+            message,
+        });
+    }
+    let log = run_git(repo, ["bisect", "log"])
+        .map(|output| String::from_utf8_lossy(&output).into_owned())
+        .unwrap_or_default();
+    let culprit_hash = parse_bisect_culprit(&message).or_else(|| parse_bisect_culprit(&log));
+    let current = bisect_commit_for_ref(repo, "HEAD")?;
+    let culprit = culprit_hash
+        .as_deref()
+        .map(|hash| bisect_commit_for_ref(repo, hash))
+        .transpose()?;
+    let (remaining_revisions, remaining_steps) = parse_bisect_progress(&message);
+    Ok(BisectState {
+        active,
+        finished: culprit.is_some(),
+        current: Some(current),
+        culprit,
+        remaining_revisions,
+        remaining_steps,
+        message,
+    })
+}
+
+#[tauri::command]
+pub async fn get_bisect_state(path: String) -> Result<BisectState, String> {
+    run_git_task("Could not inspect Git bisect", move || {
+        let repo = resolve_repo(&path)?;
+        bisect_state_for_repo(&repo, String::new())
+    })
+    .await
+}
+
+#[tauri::command]
+pub async fn start_bisect(path: String, good: String, bad: String) -> Result<BisectState, String> {
+    run_git_task("Could not start Git bisect", move || {
+        let repo = resolve_repo(&path)?;
+        if bisect_in_progress(&repo)? {
+            return Err("A Git bisect session is already active.".to_string());
+        }
+        let status = status_for_repo(&repo)?;
+        if !status.clean {
+            return Err(
+                "Commit or stash working tree changes before starting Git bisect.".to_string(),
+            );
+        }
+        if status.rebase_in_progress || status.cherry_pick_in_progress || status.merge_in_progress {
+            return Err("Finish the current Git operation before starting Git bisect.".to_string());
+        }
+        let good_hash = verify_commit(&repo, &good)?;
+        let bad_hash = verify_commit(&repo, &bad)?;
+        if good_hash == bad_hash {
+            return Err("Good and bad must reference different commits.".to_string());
+        }
+        let ancestry = git_command()
+            .arg("-C")
+            .arg(&repo)
+            .args([
+                "merge-base",
+                "--is-ancestor",
+                good_hash.as_str(),
+                bad_hash.as_str(),
+            ])
+            .output()
+            .map_err(|err| format!("Could not start Git. Is Git installed? {err}"))?;
+        if !ancestry.status.success() {
+            return Err("The good commit must be an ancestor of the bad commit.".to_string());
+        }
+        let output = run_git(
+            &repo,
+            ["bisect", "start", bad_hash.as_str(), good_hash.as_str()],
+        )?;
+        bisect_state_for_repo(&repo, String::from_utf8_lossy(&output).trim().to_string())
+    })
+    .await
+}
+
+#[tauri::command]
+pub async fn mark_bisect(path: String, verdict: String) -> Result<BisectState, String> {
+    run_git_task("Could not continue Git bisect", move || {
+        let repo = resolve_repo(&path)?;
+        if !bisect_in_progress(&repo)? {
+            return Err("No Git bisect session is active.".to_string());
+        }
+        let verdict = match verdict.as_str() {
+            "good" => "good",
+            "bad" => "bad",
+            "skip" => "skip",
+            _ => return Err("Bisect verdict must be good, bad, or skip.".to_string()),
+        };
+        let output = run_git(&repo, ["bisect", verdict])?;
+        bisect_state_for_repo(&repo, String::from_utf8_lossy(&output).trim().to_string())
+    })
+    .await
+}
+
+#[tauri::command]
+pub async fn reset_bisect(path: String) -> Result<GitStatus, String> {
+    run_git_task("Could not stop Git bisect", move || {
+        let repo = resolve_repo(&path)?;
+        if bisect_in_progress(&repo)? {
+            run_git(&repo, ["bisect", "reset"])?;
+        }
+        status_for_repo(&repo)
+    })
+    .await
+}
+
 fn interactive_rebase_commits_for_repo(
     repo: &Path,
     base: &str,
@@ -10117,4 +10312,69 @@ mod tests {
         assert_eq!(git_output_test(&repo.path, ["ls-files"]), "keep.txt");
         assert!(repo.path.join("keep.txt").is_file());
     }
+
+    #[test]
+    fn parses_bisect_progress_and_culprit_output() {
+        let message = "Bisecting: 7 revisions left to test after this (roughly 3 steps)\nabc123 is the first 'bad' commit";
+        assert_eq!(parse_bisect_progress(message), (Some(7), Some(3)));
+        assert_eq!(parse_bisect_culprit(message).as_deref(), Some("abc123"));
+        assert_eq!(
+            parse_bisect_culprit("# first 'bad' commit: [def456] broken behavior").as_deref(),
+            Some("def456")
+        );
+    }
+
+    #[test]
+    fn bisect_state_tracks_a_complete_session_and_reset() {
+        let repo = init_temp_repo("bisect_session");
+        let mut hashes = Vec::new();
+        for index in 0..6 {
+            fs::write(repo.path.join("value.txt"), format!("{index}\n"))
+                .expect("fixture should be written");
+            run_git_test(&repo.path, ["add", "value.txt"]);
+            run_git_test(
+                &repo.path,
+                ["commit", "-q", "-m", &format!("commit {index}")],
+            );
+            hashes.push(git_output_test(&repo.path, ["rev-parse", "HEAD"]));
+        }
+
+        let output = run_git(
+            &repo.path,
+            ["bisect", "start", hashes[5].as_str(), hashes[0].as_str()],
+        )
+        .expect("bisect should start");
+        let mut state = bisect_state_for_repo(
+            &repo.path,
+            String::from_utf8_lossy(&output).trim().to_string(),
+        )
+        .expect("bisect state should load");
+        assert!(state.active);
+        assert!(state.current.is_some());
+
+        for _ in 0..8 {
+            if state.finished {
+                break;
+            }
+            let output =
+                run_git(&repo.path, ["bisect", "good"]).expect("bisect verdict should succeed");
+            state = bisect_state_for_repo(
+                &repo.path,
+                String::from_utf8_lossy(&output).trim().to_string(),
+            )
+            .expect("bisect state should advance");
+        }
+        assert!(state.finished);
+        assert_eq!(
+            state.culprit.as_ref().map(|commit| &commit.hash),
+            Some(&hashes[5])
+        );
+
+        run_git(&repo.path, ["bisect", "reset"]).expect("bisect should reset");
+        assert!(!bisect_in_progress(&repo.path).expect("bisect state should be readable"));
+        assert_eq!(
+            git_output_test(&repo.path, ["rev-parse", "HEAD"]),
+            hashes[5]
+        );
+    }
 }
diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index b8a3d55..ca96627 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -17,20 +17,21 @@ use git::{
     commit_ai_review, commit_ai_split, compare_commits, compare_file_to_head,
     compare_file_to_parent, create_branch, create_tag, cred_delete, cred_load, cred_save,
     delete_branch, delete_commit_note, delete_remote_branch, delete_remote_branches, delete_tag,
-    diff_file_against_working_tree, fetch, fetch_commit_notes, get_commit_note, get_file_blame,
-    get_file_patch, get_remote_url, get_status, git_lfs_install, git_lfs_prune, git_lfs_pull,
-    git_lfs_status, git_lfs_track, git_lfs_untrack, init_repository, last_commit_message,
-    list_branches, list_commits, list_file_history, list_interactive_rebase_commits, list_reflog,
-    list_remotes, list_repository_files, list_stashes, list_tags, list_worktrees, lock_worktree,
-    merge_abort, merge_branch, merge_continue, move_worktree, open_repo_in_explorer,
-    open_repository, open_repository_bundle, open_repository_file, prune_worktrees, pull, push,
-    push_commit_notes, push_tag, read_conflict, rebase_abort, rebase_branch, rebase_continue,
-    remove_remote, remove_worktree, rename_branch, rename_remote_branch, repair_worktree,
-    resolve_conflict, resolve_conflict_side, restore_file_from_commit, restore_files,
-    restore_reflog_entry, restore_to_commit, revert_commit, run_sequence_editor_if_requested,
-    search_code_introductions, set_branch_upstream, set_commit_note, stage_files,
-    start_interactive_rebase, stash_apply, stash_drop, stash_pop, stash_push, undo_last_commit,
-    unlock_worktree, unstage_files, untrack_paths, update_remote,
+    diff_file_against_working_tree, fetch, fetch_commit_notes, get_bisect_state, get_commit_note,
+    get_file_blame, get_file_patch, get_remote_url, get_status, git_lfs_install, git_lfs_prune,
+    git_lfs_pull, git_lfs_status, git_lfs_track, git_lfs_untrack, init_repository,
+    last_commit_message, list_branches, list_commits, list_file_history,
+    list_interactive_rebase_commits, list_reflog, list_remotes, list_repository_files,
+    list_stashes, list_tags, list_worktrees, lock_worktree, mark_bisect, merge_abort, merge_branch,
+    merge_continue, move_worktree, open_repo_in_explorer, open_repository, open_repository_bundle,
+    open_repository_file, prune_worktrees, pull, push, push_commit_notes, push_tag, read_conflict,
+    rebase_abort, rebase_branch, rebase_continue, remove_remote, remove_worktree, rename_branch,
+    rename_remote_branch, repair_worktree, reset_bisect, resolve_conflict, resolve_conflict_side,
+    restore_file_from_commit, restore_files, restore_reflog_entry, restore_to_commit,
+    revert_commit, run_sequence_editor_if_requested, search_code_introductions,
+    set_branch_upstream, set_commit_note, stage_files, start_bisect, start_interactive_rebase,
+    stash_apply, stash_drop, stash_pop, stash_push, undo_last_commit, unlock_worktree,
+    unstage_files, untrack_paths, update_remote,
 };
 use integrations::list_integration_repositories;
 use std::path::{Path, PathBuf};
@@ -411,6 +412,10 @@ async fn main() {
             start_interactive_rebase,
             list_reflog,
             restore_reflog_entry,
+            get_bisect_state,
+            start_bisect,
+            mark_bisect,
+            reset_bisect,
             list_repository_files,
             open_repository_bundle,
             list_file_history,
diff --git a/src/App.svelte b/src/App.svelte
index 34ca14b..77815a5 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -68,6 +68,7 @@
     compareFileToParent,
     fetchCommitNotes,
     fetchRemote,
+    getBisectState,
     getCommitNote,
     getFileBlame,
     getGitLfsStatus,
@@ -85,6 +86,7 @@
     listReflog,
     listRepositoryFiles,
     mergeBranch,
+    markBisect,
     mergeAbort,
     mergeContinue,
     openRepoInExplorer,
@@ -102,6 +104,7 @@
     removeRemote,
     removeWorktree,
     repairWorktree,
+    resetBisect,
     revertCommit,
     setBranchUpstream,
     setCommitNote,
@@ -128,6 +131,7 @@
     restoreFiles,
     restoreToCommit,
     searchCodeIntroductions,
+    startBisect,
     startInteractiveRebase,
     setSyncBadge,
     stageFiles,
@@ -151,6 +155,7 @@
     AppLanguage,
     AppTheme,
     AnalyticsSettings,
+    BisectState,
     CloneOptions,
     CustomThemeColors,
     ConflictFile,
@@ -423,6 +428,10 @@
   let reflogEntries: ReflogEntry[] = [];
   let reflogLoading = false;
   let reflogError = "";
+  let bisectOpen = false;
+  let bisectState: BisectState | null = null;
+  let bisectLoading = false;
+  let bisectError = "";
   let selectedDiffPath = "";
   let diffHighlightQuery = "";
   let pendingRestoreFile: { commit: GitCommit; file: GitCommitFile } | null = null;
@@ -999,7 +1008,7 @@
   }
 
   async function autoRefreshTick() {
-    if (appShuttingDown || !autoRefreshEnabled || activeView !== "repository" || !activeRepoPath || isBusy || autoRefreshInFlight || resolveDialogOpen || compareDialogOpen || compareSelectOpen || interactiveRebaseOpen || reflogOpen || worktreeDialogOpen || gitLfsDialogOpen || newBranchCommit || commitNoteTarget || globalSearchOpen || helpOpen) return;
+    if (appShuttingDown || !autoRefreshEnabled || activeView !== "repository" || !activeRepoPath || isBusy || autoRefreshInFlight || resolveDialogOpen || compareDialogOpen || compareSelectOpen || interactiveRebaseOpen || reflogOpen || bisectOpen || worktreeDialogOpen || gitLfsDialogOpen || newBranchCommit || commitNoteTarget || globalSearchOpen || helpOpen) return;
     const path = activeRepoPath;
     autoRefreshInFlight = true;
     try {
@@ -3325,6 +3334,57 @@
     }
   }
 
+  async function openBisect() {
+    if (!hasRepository || isBusy) return;
+    bisectOpen = true;
+    bisectState = null;
+    bisectError = "";
+    bisectLoading = true;
+    try {
+      bisectState = await getBisectState(activeRepoPath);
+      trackEvent("bisect_opened", { active: bisectState.active ? 1 : 0 });
+    } catch (error) {
+      bisectError = errorToMessage(error);
+    } finally {
+      bisectLoading = false;
+    }
+  }
+
+  async function beginBisect(good: string, bad: string) {
+    if (!activeRepoPath || isBusy) return;
+    bisectError = "";
+    await runOperation("Starting Git bisect", async () => {
+      bisectState = await startBisect(activeRepoPath, good, bad);
+      await refreshRepositoryViews(activeRepoPath);
+      trackEvent("bisect_started");
+    });
+    if (bisectOpen && errorMessage) bisectError = errorMessage;
+  }
+
+  async function continueBisect(verdict: "good" | "bad" | "skip") {
+    if (!activeRepoPath || isBusy) return;
+    bisectError = "";
+    await runOperation("Continuing Git bisect", async () => {
+      bisectState = await markBisect(activeRepoPath, verdict);
+      await refreshRepositoryViews(activeRepoPath);
+      trackEvent("bisect_commit_marked", { verdict, finished: bisectState.finished ? 1 : 0 });
+    });
+    if (bisectOpen && errorMessage) bisectError = errorMessage;
+  }
+
+  async function stopBisect() {
+    if (!activeRepoPath || isBusy) return;
+    bisectError = "";
+    await runOperation("Stopping Git bisect", async () => {
+      applyStatus(await resetBisect(activeRepoPath));
+      bisectOpen = false;
+      bisectState = null;
+      await refreshRepositoryViews(activeRepoPath);
+      trackEvent("bisect_stopped");
+    });
+    if (bisectOpen && errorMessage) bisectError = errorMessage;
+  }
+
   async function previewReflogEntry(entry: ReflogEntry) {
     if (!activeRepoPath || isBusy) return;
     await runOperation("Previewing reflog entry", async () => {
@@ -5041,6 +5101,7 @@
     else if (event.key === "Escape" && gitLfsDialogOpen) closeGitLfsDialog();
     else if (event.key === "Escape" && interactiveRebaseOpen && !isBusy) interactiveRebaseOpen = false;
     else if (event.key === "Escape" && reflogOpen && !isBusy) reflogOpen = false;
+    else if (event.key === "Escape" && bisectOpen && !isBusy) bisectOpen = false;
     else if (event.key === "Escape" && compareSelectOpen) compareSelectOpen = false;
     else if (event.key === "Escape" && globalSearchOpen) closeGlobalSearchDialog();
   }
@@ -5106,6 +5167,7 @@
         onCompare={openCompareSelect}
         onInteractiveRebase={openInteractiveRebase}
         onReflog={openReflog}
+        onBisect={openBisect}
         onOpenInEditor={openActiveRepoInEditor}
         onOpenTerminal={openActiveRepoTerminal}
         onOpenInExplorer={openActiveRepoFileManager}
@@ -5579,6 +5641,7 @@
     onOpenSearch={openGlobalSearchDialog}
     onOpenCompare={openCompareSelect}
     onOpenReflog={openReflog}
+    onOpenBisect={openBisect}
     onOpenInteractiveRebase={openInteractiveRebase}
     onOpenWorktrees={openWorktreeDialog}
     onOpenSyncSettings={openSyncOptions}
@@ -5879,6 +5942,23 @@
   />
 {/if}
 
+{#if bisectOpen}
+  {#await import("./lib/components/BisectDialog.svelte") then module}
+    <module.default
+      language={appLanguage}
+      {bisectState}
+      isLoading={bisectLoading}
+      {isBusy}
+      {operation}
+      error={bisectError}
+      onStart={beginBisect}
+      onMark={continueBisect}
+      onReset={stopBisect}
+      onClose={() => { if (!isBusy) bisectOpen = false; }}
+    />
+  {/await}
+{/if}
+
 <!-- Compare: pick two branches or commits to diff -->
 {#if compareSelectOpen}
   <CompareSelectDialog
diff --git a/src/lib/RepoToolbar.svelte b/src/lib/RepoToolbar.svelte
index 5da1503..96ad4e5 100644
--- a/src/lib/RepoToolbar.svelte
+++ b/src/lib/RepoToolbar.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
   import {
     Box,
+    Bug,
     ChevronDown,
     Code2,
     CloudDownload,
@@ -36,6 +37,7 @@
   export let onCompare: () => void = () => {};
   export let onInteractiveRebase: () => void = () => {};
   export let onReflog: () => void = () => {};
+  export let onBisect: () => void = () => {};
   export let onOpenInExplorer: () => void = () => {};
   export let onOpenInEditor: () => void = () => {};
   export let onOpenTerminal: () => void = () => {};
@@ -208,6 +210,13 @@
               <small>{isGerman ? "Commits ordnen und zusammenfassen" : "Reorder and combine commits"}</small>
             </span>
           </button>
+          <button type="button" role="menuitem" onclick={() => runHistoryAction(onBisect)}>
+            <Bug size={15} aria-hidden="true" />
+            <span>
+              <strong>Git Bisect</strong>
+              <small>{isGerman ? "Fehlerhaften Commit schrittweise finden" : "Find a bad commit step by step"}</small>
+            </span>
+          </button>
         </div>
       {/if}
     </div>
diff --git a/src/lib/components/BisectDialog.svelte b/src/lib/components/BisectDialog.svelte
new file mode 100644
index 0000000..10aa554
--- /dev/null
+++ b/src/lib/components/BisectDialog.svelte
@@ -0,0 +1,142 @@
+<script lang="ts">
+  import { AlertTriangle, Bug, Check, GitCommitHorizontal, LoaderCircle, Play, RotateCcw, SkipForward, X } from "@lucide/svelte";
+  import type { BisectState } from "../types";
+
+  interface Props {
+    language: "en" | "de";
+    bisectState: BisectState | null;
+    isLoading: boolean;
+    isBusy: boolean;
+    operation: string;
+    error: string;
+    onStart: (good: string, bad: string) => void;
+    onMark: (verdict: "good" | "bad" | "skip") => void;
+    onReset: () => void;
+    onClose: () => void;
+  }
+
+  let { language = "en", bisectState = null, isLoading = false, isBusy = false, operation = "", error = "", onStart = () => {}, onMark = () => {}, onReset = () => {}, onClose = () => {} }: Props = $props();
+  let good = $state("");
+  let bad = $state("HEAD");
+  const de = $derived(language === "de");
+  const canStart = $derived(Boolean(good.trim() && bad.trim()) && !isLoading && !isBusy);
+</script>
+
+<div class="dialog-backdrop app-chrome-backdrop" role="presentation">
+  <div class="dialog bisect-dialog" role="dialog" aria-modal="true" aria-label={de ? "Geführtes Git Bisect" : "Guided Git bisect"} tabindex="-1">
+    <header class="dialog-header">
+      <div><span class="eyebrow">{de ? "Fehlerursache eingrenzen" : "Find the regression"}</span><h2 class="dialog-title">Git Bisect</h2></div>
+      <button class="dialog-close" type="button" onclick={onClose} disabled={isBusy} title={de ? "Schließen" : "Close"}><X size={18} aria-hidden="true" /></button>
+    </header>
+
+    <div class="bisect-body">
+      {#if error}<div class="bisect-notice error"><AlertTriangle size={16} /><span>{error}</span></div>{/if}
+
+      {#if isLoading}
+        <div class="bisect-loading"><LoaderCircle class="spin" size={18} />{de ? "Bisect-Status wird geladen …" : "Loading bisect status …"}</div>
+      {:else if !bisectState?.active}
+        <section class="bisect-intro">
+          <div class="bisect-intro-icon"><Bug size={24} /></div>
+          <div><h3>{de ? "Welcher Commit hat den Fehler eingeführt?" : "Which commit introduced the bug?"}</h3><p>{de ? "Gitty checkt schrittweise frühere Commits aus. Markiere jede getestete Version als Good, Bad oder Skip." : "Gitty checks out earlier commits step by step. Mark each tested version as Good, Bad, or Skip."}</p></div>
+        </section>
+        <div class="bisect-range">
+          <div class="range-heading">
+            <span>{de ? "Suchbereich" : "Search range"}</span>
+            <small>{de ? "Von funktionierend bis fehlerhaft" : "From working to broken"}</small>
+          </div>
+          <div class="bisect-fields">
+            <label class="commit-field good-field">
+              <span class="field-title"><Check size={14} />{de ? "Funktionierender Commit" : "Known good commit"}<em>Good</em></span>
+              <input bind:value={good} placeholder={de ? "z. B. v1.4.0 oder Commit-Hash" : "e.g. v1.4.0 or commit hash"} disabled={isBusy} spellcheck="false" autocomplete="off" />
+              <small>{de ? "Hier trat der Fehler noch nicht auf." : "The bug did not occur here."}</small>
+            </label>
+            <label class="commit-field bad-field">
+              <span class="field-title"><Bug size={14} />{de ? "Fehlerhafter Commit" : "Known bad commit"}<em>Bad</em></span>
+              <input bind:value={bad} placeholder="HEAD" disabled={isBusy} spellcheck="false" autocomplete="off" />
+              <small>{de ? "Meistens HEAD, der aktuelle Commit." : "Usually HEAD, the current commit."}</small>
+            </label>
+          </div>
+        </div>
+        <div class="bisect-notice"><AlertTriangle size={15} /><span>{de ? "Der Arbeitsbaum muss sauber sein. Während des Bisects wechselt Gitty vorübergehend zwischen Commits." : "The working tree must be clean. Gitty temporarily switches between commits during the bisect."}</span></div>
+      {:else if bisectState.finished && bisectState.culprit}
+        <section class="bisect-result">
+          <div class="result-icon"><Bug size={22} /></div>
+          <div><span>{de ? "Erster fehlerhafter Commit gefunden" : "First bad commit found"}</span><h3>{bisectState.culprit.summary}</h3><div class="commit-meta"><code>{bisectState.culprit.short_hash}</code><span>{bisectState.culprit.author_name}</span><span>{new Date(bisectState.culprit.date).toLocaleString()}</span></div></div>
+        </section>
+        <p class="result-copy">{de ? "Beende den Bisect, um zum ursprünglichen Branch und Arbeitsstand zurückzukehren." : "Finish the bisect to return to the original branch and working state."}</p>
+      {:else if bisectState.current}
+        <div class="bisect-progress">
+          <span>{de ? "Aktueller Test-Commit" : "Current test commit"}</span>
+          {#if bisectState.remaining_steps !== null}<strong>{de ? `Noch ungefähr ${bisectState.remaining_steps} Schritte` : `About ${bisectState.remaining_steps} steps remaining`}</strong>{/if}
+        </div>
+        <section class="bisect-current">
+          <GitCommitHorizontal size={22} />
+          <div><h3>{bisectState.current.summary}</h3><div class="commit-meta"><code>{bisectState.current.short_hash}</code><span>{bisectState.current.author_name}</span><span>{new Date(bisectState.current.date).toLocaleString()}</span></div></div>
+        </section>
+        <div class="bisect-question"><strong>{de ? "Tritt der Fehler bei diesem Commit auf?" : "Does the bug occur at this commit?"}</strong><span>{de ? "Teste die Anwendung oder führe deine Prüfschritte aus, bevor du entscheidest." : "Test the application or run your checks before choosing a verdict."}</span></div>
+        <div class="verdict-grid">
+          <button class="verdict good" type="button" onclick={() => onMark("good")} disabled={isBusy}><Check size={17} /><span><strong>Good</strong><small>{de ? "Fehler tritt nicht auf" : "Bug is absent"}</small></span></button>
+          <button class="verdict bad" type="button" onclick={() => onMark("bad")} disabled={isBusy}><Bug size={17} /><span><strong>Bad</strong><small>{de ? "Fehler tritt auf" : "Bug occurs"}</small></span></button>
+          <button class="verdict skip" type="button" onclick={() => onMark("skip")} disabled={isBusy}><SkipForward size={17} /><span><strong>Skip</strong><small>{de ? "Nicht testbar" : "Cannot test"}</small></span></button>
+        </div>
+      {/if}
+    </div>
+
+    <footer class="dialog-footer bisect-footer">
+      {#if bisectState?.active}
+        <button class="btn-secondary reset" type="button" onclick={onReset} disabled={isBusy}><RotateCcw size={15} />{bisectState.finished ? (de ? "Bisect beenden" : "Finish bisect") : (de ? "Bisect abbrechen" : "Abort bisect")}</button>
+        <button class="btn-secondary" type="button" onclick={onClose} disabled={isBusy}>{de ? "Später fortsetzen" : "Continue later"}</button>
+      {:else}
+        <button class="btn-secondary" type="button" onclick={onClose} disabled={isBusy}>{de ? "Abbrechen" : "Cancel"}</button>
+        <button class="btn-primary" type="button" onclick={() => onStart(good.trim(), bad.trim())} disabled={!canStart}>{#if operation === "Starting Git bisect"}<LoaderCircle class="spin" size={16} />{:else}<Play size={16} />{/if}{de ? "Bisect starten" : "Start bisect"}</button>
+      {/if}
+    </footer>
+  </div>
+</div>
+
+<style>
+  .bisect-dialog{grid-template-rows:auto minmax(0,auto) auto;width:min(640px,calc(100vw - 28px));height:auto;max-height:calc(100vh - 40px);overflow:hidden}
+  .bisect-body{display:grid;align-content:start;gap:14px;padding:16px 18px;overflow:auto}
+  .bisect-loading{display:flex;min-height:150px;align-items:center;justify-content:center;gap:8px;color:var(--color-ink-muted)}
+  .bisect-intro,.bisect-current,.bisect-result{display:flex;align-items:flex-start;gap:12px}
+  .bisect-intro-icon,.result-icon{display:grid;width:38px;height:38px;flex:0 0 38px;place-items:center;border:1px solid color-mix(in srgb,var(--color-primary) 32%,var(--color-border));border-radius:8px;color:var(--color-primary);background:color-mix(in srgb,var(--color-primary) 9%,var(--color-surface))}
+  .bisect-intro h3,.bisect-current h3,.bisect-result h3{margin:0;font-size:13px}
+  .bisect-intro p,.result-copy{max-width:520px;margin:4px 0 0;color:var(--color-ink-muted);font-size:12px;line-height:1.45}
+  .bisect-range{display:grid;gap:9px;padding:12px;border:1px solid var(--color-border-subtle);border-radius:9px;background:color-mix(in srgb,var(--color-surface) 72%,transparent)}
+  .range-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
+  .range-heading>span{color:var(--color-ink);font-size:10px;font-weight:800;letter-spacing:.07em;text-transform:uppercase}
+  .range-heading>small{color:var(--color-ink-faint);font-size:10px}
+  .bisect-fields{display:grid;grid-template-columns:1fr 1fr;gap:10px}
+  .commit-field{display:grid;gap:6px;padding:10px;border:1px solid var(--color-border-subtle);border-radius:7px;background:var(--color-surface-raised)}
+  .field-title{display:flex;align-items:center;gap:6px;color:var(--color-ink);font-size:11px;font-weight:700}
+  .field-title em{margin-left:auto;padding:1px 5px;border-radius:4px;font-size:9px;font-style:normal;font-weight:800;text-transform:uppercase}
+  .good-field .field-title :global(svg),.good-field .field-title em{color:#69c986}
+  .good-field .field-title em{background:color-mix(in srgb,#69c986 10%,transparent)}
+  .bad-field .field-title :global(svg),.bad-field .field-title em{color:#ef737b}
+  .bad-field .field-title em{background:color-mix(in srgb,#ef737b 10%,transparent)}
+  .bisect-fields input{height:32px;font-family:var(--font-mono);font-size:11.5px}
+  .bisect-fields small{color:var(--color-ink-faint);font-size:9.5px;line-height:1.35}
+  .bisect-notice{display:flex;align-items:flex-start;gap:8px;padding:9px 11px;border:1px solid color-mix(in srgb,#e2ad4e 28%,var(--color-border));border-radius:7px;color:var(--color-ink-muted);background:color-mix(in srgb,#e2ad4e 6%,var(--color-surface));font-size:11.5px;line-height:1.4}
+  .bisect-notice :global(svg){flex:0 0 auto;color:#e2ad4e}
+  .bisect-notice.error{border-color:color-mix(in srgb,#e45c65 40%,var(--color-border));color:#ef979d;background:color-mix(in srgb,#c92f3a 8%,var(--color-surface))}
+  .bisect-notice.error :global(svg){color:#ef6972}
+  .bisect-progress{display:flex;align-items:center;justify-content:space-between;color:var(--color-ink-muted);font-size:11px}
+  .bisect-progress strong{color:var(--color-primary)}
+  .bisect-current{padding:14px;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface)}
+  .bisect-current>:global(svg){flex:0 0 auto;color:var(--color-primary)}
+  .commit-meta{display:flex;flex-wrap:wrap;align-items:center;gap:7px 12px;margin-top:7px;color:var(--color-ink-faint);font-size:10px}
+  .commit-meta code{padding:2px 5px;border-radius:4px;color:var(--color-primary);background:color-mix(in srgb,var(--color-primary) 10%,transparent)}
+  .bisect-question{display:grid;gap:4px}
+  .bisect-question span{color:var(--color-ink-muted);font-size:11px}
+  .verdict-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
+  .verdict{min-height:58px;justify-content:flex-start;padding:8px 11px;text-align:left}
+  .verdict>span{display:grid;gap:2px}
+  .verdict small{color:var(--color-ink-faint);font-size:9.5px}
+  .verdict.good{color:#69c986}.verdict.bad{color:#ef737b}.verdict.skip{color:#ddb45c}
+  .bisect-result{padding:16px;border:1px solid color-mix(in srgb,#ef737b 36%,var(--color-border));border-radius:8px;background:color-mix(in srgb,#c92f3a 7%,var(--color-surface))}
+  .bisect-result>div:last-child>span{color:#ef838b;font-size:10px;font-weight:800;text-transform:uppercase}
+  .result-copy{margin:0}
+  .bisect-footer{justify-content:flex-end;padding-block:9px}
+  .bisect-footer .reset{margin-right:auto}
+  @media(max-width:620px){.bisect-fields,.verdict-grid{grid-template-columns:1fr}.bisect-body{padding:14px}.range-heading{align-items:flex-start;flex-direction:column;gap:2px}.bisect-progress{align-items:flex-start;flex-direction:column;gap:4px}}
+</style>
diff --git a/src/lib/components/CommandPalette.svelte b/src/lib/components/CommandPalette.svelte
index f18e6d4..5629ed1 100644
--- a/src/lib/components/CommandPalette.svelte
+++ b/src/lib/components/CommandPalette.svelte
@@ -1,12 +1,12 @@
 <script lang="ts">
   import { onMount } from "svelte";
   import {
-    ArrowDownToLine, ArrowUpFromLine, Boxes, CircleHelp, FileCode, GitBranch,
+    ArrowDownToLine, ArrowUpFromLine, Boxes, Bug, CircleHelp, FileCode, GitBranch,
     GitCompare, History, RefreshCw, Search, Settings, SlidersHorizontal, Sparkles,
   } from "@lucide/svelte";
   import type { AppLanguage, GitBranch as GitBranchInfo, GitCommit, GitRepositoryFile } from "../types";
 
-  type ItemKind = "fetch" | "pull" | "push" | "refresh" | "search" | "compare" | "reflog" | "rebase" | "worktrees" | "sync" | "settings" | "ai-settings" | "help" | "branch" | "file" | "commit";
+  type ItemKind = "fetch" | "pull" | "push" | "refresh" | "search" | "compare" | "reflog" | "rebase" | "bisect" | "worktrees" | "sync" | "settings" | "ai-settings" | "help" | "branch" | "file" | "commit";
   interface Item { id: string; group: string; kind: ItemKind; title: string; subtitle: string; search: string; disabled?: boolean; run: () => void | Promise<void>; }
   interface Props {
     language: AppLanguage; hasRepository: boolean; isBusy: boolean;
@@ -17,7 +17,7 @@
     onSelectCommit: (commit: GitCommit) => void | Promise<void>;
     onFetch: () => void | Promise<void>; onPull: () => void | Promise<void>; onPush: () => void | Promise<void>;
     onRefresh: () => void | Promise<void>; onOpenSearch: () => void; onOpenCompare: () => void;
-    onOpenReflog: () => void | Promise<void>; onOpenInteractiveRebase: () => void;
+    onOpenReflog: () => void | Promise<void>; onOpenInteractiveRebase: () => void; onOpenBisect: () => void | Promise<void>;
     onOpenWorktrees: () => void | Promise<void>; onOpenSyncSettings: () => void | Promise<void>;
     onOpenSettings: () => void; onOpenAiSettings: () => void; onOpenHelp: () => void;
   }
@@ -26,7 +26,7 @@
     language = "en", hasRepository = false, isBusy = false, branches = [], files = [], commits = [], onClose = () => {},
     onCheckoutBranch = () => {}, onOpenFile = () => {}, onSelectCommit = () => {}, onFetch = () => {}, onPull = () => {},
     onPush = () => {}, onRefresh = () => {}, onOpenSearch = () => {}, onOpenCompare = () => {}, onOpenReflog = () => {},
-    onOpenInteractiveRebase = () => {}, onOpenWorktrees = () => {}, onOpenSyncSettings = () => {}, onOpenSettings = () => {},
+    onOpenInteractiveRebase = () => {}, onOpenBisect = () => {}, onOpenWorktrees = () => {}, onOpenSyncSettings = () => {}, onOpenSettings = () => {},
     onOpenAiSettings = () => {}, onOpenHelp = () => {},
   }: Props = $props();
 
@@ -50,6 +50,7 @@
     action("compare", "compare", isGerman ? "Branches oder Commits vergleichen" : "Compare branches or commits", isGerman ? "Zwei vollständige Revisionen vergleichen" : "Diff two complete revisions", onOpenCompare),
     action("reflog", "reflog", "Reflog", isGerman ? "Verlorene Commits finden und wiederherstellen" : "Find and recover lost commits", onOpenReflog),
     action("rebase", "rebase", "Interactive Rebase", isGerman ? "Commit-Historie bearbeiten" : "Edit commit history", onOpenInteractiveRebase),
+    action("bisect", "bisect", "Git Bisect", isGerman ? "Fehlerhaften Commit schrittweise finden" : "Find a bad commit step by step", onOpenBisect),
     action("worktrees", "worktrees", "Worktrees", isGerman ? "Arbeitsverzeichnisse verwalten" : "Manage linked working trees", onOpenWorktrees),
     action("sync", "sync", isGerman ? "Synchronisierung konfigurieren" : "Configure synchronization", isGerman ? "Remote, Upstream und Pull-Strategie" : "Remote, upstream and pull strategy", onOpenSyncSettings),
     action("settings", "settings", isGerman ? "Einstellungen" : "Settings", isGerman ? "Darstellung, Sprache und Verhalten" : "Appearance, language and behavior", onOpenSettings, false),
@@ -118,6 +119,7 @@
               {:else if item.kind === "compare"}<GitCompare size={16} />
               {:else if item.kind === "reflog" || item.kind === "commit"}<History size={16} />
               {:else if item.kind === "rebase" || item.kind === "branch"}<GitBranch size={16} />
+              {:else if item.kind === "bisect"}<Bug size={16} />
               {:else if item.kind === "worktrees"}<Boxes size={16} />
               {:else if item.kind === "sync"}<SlidersHorizontal size={16} />
               {:else if item.kind === "settings"}<Settings size={16} />
diff --git a/src/lib/git.ts b/src/lib/git.ts
index 30e974e..39d70aa 100644
--- a/src/lib/git.ts
+++ b/src/lib/git.ts
@@ -3,6 +3,7 @@ import { tracedInvoke as invoke } from "./telemetry";
 import type {
   AiReviewResult,
   AiCommitPlan,
+  BisectState,
   CommitAiProvider,
   CloneOptions,
   ConflictFile,
@@ -104,6 +105,22 @@ export function getStatus(path: string): Promise<GitStatus> {
   return invoke<GitStatus>("get_status", { path });
 }
 
+export function getBisectState(path: string): Promise<BisectState> {
+  return invoke<BisectState>("get_bisect_state", { path });
+}
+
+export function startBisect(path: string, good: string, bad: string): Promise<BisectState> {
+  return invoke<BisectState>("start_bisect", { path, good, bad });
+}
+
+export function markBisect(path: string, verdict: "good" | "bad" | "skip"): Promise<BisectState> {
+  return invoke<BisectState>("mark_bisect", { path, verdict });
+}
+
+export function resetBisect(path: string): Promise<GitStatus> {
+  return invoke<GitStatus>("reset_bisect", { path });
+}
+
 export function getGitLfsStatus(path: string): Promise<GitLfsStatus> {
   return invoke<GitLfsStatus>("git_lfs_status", { path });
 }
diff --git a/src/lib/types.ts b/src/lib/types.ts
index 7e15132..5e178c7 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -236,6 +236,24 @@ export interface GitCommit {
   has_note: boolean;
 }
 
+export interface BisectCommit {
+  hash: string;
+  short_hash: string;
+  summary: string;
+  author_name: string;
+  date: string;
+}
+
+export interface BisectState {
+  active: boolean;
+  finished: boolean;
+  current: BisectCommit | null;
+  culprit: BisectCommit | null;
+  remaining_revisions: number | null;
+  remaining_steps: number | null;
+  message: string;
+}
+
 export interface GitCommitFile {
   path: string;
   old_path: string | null;