diff --git a/src/App.test.tsx b/src/App.test.tsx
index eebcd47..5edf7d8 100644
--- a/src/App.test.tsx
+++ b/src/App.test.tsx
@@ -13,6 +13,7 @@ vi.mock("./lib/tauri", async (importOriginal) => {
   return {
     ...actual,
     authGetStatus: vi.fn().mockResolvedValue({ connected: true, username: "test-user", error: null }),
+    listNotifications: vi.fn().mockResolvedValue([]),
   };
 });
 
diff --git a/src/components/Sidebar/Sidebar.test.tsx b/src/components/Sidebar/Sidebar.test.tsx
index 8553b93..55c419f 100644
--- a/src/components/Sidebar/Sidebar.test.tsx
+++ b/src/components/Sidebar/Sidebar.test.tsx
@@ -66,6 +66,38 @@ vi.mock("../../lib/tauri", () => ({
       lastSyncAt: "2026-03-28T10:00:00Z",
     },
   ]),
+  listNotifications: vi.fn().mockResolvedValue([
+    {
+      id: "notif-1",
+      title: "Unread review request",
+      url: "https://github.com/acme/frontend/pull/1",
+      unread: true,
+      updatedAt: "2026-03-28T10:00:00Z",
+      repo: "acme/frontend",
+      reason: "review_requested",
+      notificationType: "pullRequest",
+    },
+    {
+      id: "notif-2",
+      title: "Unread issue mention",
+      url: "https://github.com/acme/frontend/issues/2",
+      unread: true,
+      updatedAt: "2026-03-28T11:00:00Z",
+      repo: "acme/frontend",
+      reason: "mention",
+      notificationType: "issue",
+    },
+    {
+      id: "notif-3",
+      title: "Read merge comment",
+      url: "https://github.com/acme/frontend/pull/3",
+      unread: false,
+      updatedAt: "2026-03-28T12:00:00Z",
+      repo: "acme/frontend",
+      reason: "comment",
+      notificationType: "pullRequest",
+    },
+  ]),
   setRepoEnabled: vi.fn().mockResolvedValue({}),
   authGetStatus: vi.fn().mockResolvedValue({
     connected: true,
@@ -109,6 +141,11 @@ describe("Sidebar", () => {
     expect(screen.getByText("3")).toBeInTheDocument();
   });
 
+  it("should show unread notification count", async () => {
+    renderSidebar();
+    expect(await screen.findByRole("button", { name: /notifications \(2\)/i })).toBeInTheDocument();
+  });
+
   it("should show workspace dots with state colors", () => {
     const { container } = renderSidebar();
     const dots = container.querySelectorAll("[data-state]");
diff --git a/src/components/Sidebar/Sidebar.tsx b/src/components/Sidebar/Sidebar.tsx
index 7fc409f..5054916 100644
--- a/src/components/Sidebar/Sidebar.tsx
+++ b/src/components/Sidebar/Sidebar.tsx
@@ -6,7 +6,7 @@ import type { DashboardView } from "../../stores/dashboard";
 import { useWorkspacesStore } from "../../stores/workspaces";
 import { useGitHubData } from "../../hooks/useGitHubData";
 import { FOCUS_RING } from "../../lib/a11y";
-import { listRepos, setRepoEnabled, authGetStatus } from "../../lib/tauri";
+import { listNotifications, listRepos, setRepoEnabled, authGetStatus } from "../../lib/tauri";
 import { NavItem } from "./NavItem";
 import { WorkspaceList } from "./WorkspaceList";
 import { RepoList } from "./RepoList";
@@ -54,6 +54,15 @@ export function Sidebar(): ReactElement {
     refetchOnWindowFocus: false,
   });
 
+  const isGitHubConnected = authQuery.data?.connected === true;
+
+  const notificationsQuery = useQuery({
+    queryKey: ["github", "notifications"],
+    queryFn: listNotifications,
+    staleTime: 60_000,
+    enabled: isGitHubConnected,
+  });
+
   const toggleRepoMutation = useMutation({
     mutationFn: ({ repoId, enabled }: { repoId: string; enabled: boolean }) =>
       setRepoEnabled(repoId, enabled),
@@ -87,6 +96,8 @@ export function Sidebar(): ReactElement {
   const repos = reposQuery.data ?? [];
   const enabledRepos = repos.filter((r) => r.enabled);
   const username = authQuery.data?.username ?? null;
+  const unreadNotificationsCount =
+    notificationsQuery.data?.filter((item) => item.unread).length ?? 0;
 
   useEffect(() => {
     if (typeof document !== "undefined" && navGroupRef.current?.contains(document.activeElement)) {
@@ -173,7 +184,13 @@ export function Sidebar(): ReactElement {
             }}
             label={item.label}
             view={item.view}
-            count={item.countKey && stats ? stats[item.countKey] : undefined}
+            count={
+              item.view === "notifications"
+                ? unreadNotificationsCount
+                : item.countKey && stats
+                  ? stats[item.countKey]
+                  : undefined
+            }
             isActive={currentView === item.view}
             tabIndex={focusedView === item.view ? 0 : -1}
             onClick={handleNavClick}