diff --git a/src/hqt/tui/app.py b/src/hqt/tui/app.py
index dd2031d..45e6402 100644
--- a/src/hqt/tui/app.py
+++ b/src/hqt/tui/app.py
@@ -73,6 +73,7 @@ class HqtApp(App):
         Binding("h", "focus_projects", "Projects"),
         Binding("l", "focus_sessions", "Sessions"),
         Binding("x", "archive_session", "Archive"),
+        Binding("A", "toggle_archived", "Show Archived"),
         Binding("d", "delete_session", "Delete Session"),
         Binding("enter", "attach_session", "Attach", priority=True),
         Binding("r", "rename_session", "Rename"),
@@ -91,6 +92,9 @@ class HqtApp(App):
         self.register_theme(FRAPPE_THEME)
         self.theme = "catppuccin-frappe"
         self._selected_project_id: int | None = None
+        # When True, the Sessions column shows this project's archived sessions
+        # instead of its active ones. Persists across project switches.
+        self._show_archived = False
         # project_id -> last selected session_id, so switching projects restores
         # each project's previously highlighted session.
         self._selected_session_by_project: dict[int, int] = {}
@@ -181,7 +185,7 @@ class HqtApp(App):
         except ServiceError as err:
             log.warning("Session poll failed: %s", err)
             return
-        if self._selected_project_id is not None:
+        if self._selected_project_id is not None and not self._show_archived:
             subset = [
                 i for i in infos if i.session.project_id == self._selected_project_id
             ]
@@ -190,7 +194,9 @@ class HqtApp(App):
     async def _refresh_sessions(self, restore_selection: bool = False) -> None:
         if self._selected_project_id is None:
             return
-        infos = await self._sessions().list_sessions(self._selected_project_id)
+        infos = await self._sessions().list_sessions(
+            self._selected_project_id, archived=self._show_archived
+        )
         sl = self.query_one(SessionList)
         if restore_selection:
             # Project switch: restore this project's remembered session, or let the
@@ -448,6 +454,11 @@ class HqtApp(App):
 
         self._run_service_worker(_do())
 
+    def action_toggle_archived(self) -> None:
+        self._show_archived = not self._show_archived
+        self.query_one(SessionList).set_mode(archived=self._show_archived)
+        self._run_service_worker(self._refresh_sessions(restore_selection=True))
+
     def action_schedule_prompt(self) -> None:
         sid = self.query_one(SessionList).get_selected_session_id()
         if sid is None:
diff --git a/tests/test_tui.py b/tests/test_tui.py
index 1afce4e..3052016 100644
--- a/tests/test_tui.py
+++ b/tests/test_tui.py
@@ -310,7 +310,7 @@ async def test_new_session_on_dismiss_sequential_create_then_refresh():
                 session=MagicMock(), spawn_ok=True, spawn_error=""
             )
 
-        async def fake_list(project_id):
+        async def fake_list(project_id, archived=False):
             call_order.append("list")
             return []
 
@@ -2088,3 +2088,42 @@ async def test_archive_session_action_calls_service_and_refreshes():
 
         mock_service.archive_session.assert_awaited_once_with(sess_id)
         mock_service.list_sessions.assert_awaited()
+
+
+@pytest.mark.asyncio
+async def test_toggle_archived_binding_exists():
+    bindings = {b.key: b for b in HqtApp.BINDINGS}
+    assert bindings["A"].action == "toggle_archived"
+
+
+@pytest.mark.asyncio
+async def test_toggle_archived_switches_list_and_header():
+    app = HqtApp()
+    async with app.run_test(size=(120, 40)) as pilot:
+        from hqt.tui.widgets.session_list import SessionList
+        from textual.widgets import Label
+
+        proj_id = 42
+        app._selected_project_id = proj_id
+
+        mock_service = MagicMock()
+        mock_service.list_sessions = AsyncMock(return_value=[])
+        mock_service.sync_window_labels = AsyncMock(return_value=[])
+        app._session_service = mock_service
+
+        assert app._show_archived is False
+
+        await app.run_action("toggle_archived")
+        await pilot.pause()
+
+        assert app._show_archived is True
+        mock_service.list_sessions.assert_awaited_with(proj_id, archived=True)
+        header = app.query_one(SessionList).query_one("#session-header", Label)
+        assert "archived" in str(header.render()).lower()
+
+        await app.run_action("toggle_archived")
+        await pilot.pause()
+
+        assert app._show_archived is False
+        mock_service.list_sessions.assert_awaited_with(proj_id, archived=False)
+        assert str(header.render()) == "Sessions"