diff --git a/.changeset/shaky-otters-care.md b/.changeset/shaky-otters-care.md
new file mode 100644
index 00000000000..b8a9919ec27
--- /dev/null
+++ b/.changeset/shaky-otters-care.md
@@ -0,0 +1,7 @@
+---
+'@clerk/backend': minor
+---
+
+Add `lastSignInAtAfter` and `lastSignInAtBefore` filters to the Users API list and count endpoints.
+
+These parameters are supported by `users.getUserList()` and are forwarded to `/v1/users` and `/v1/users/count` to filter users by last sign-in timestamp.
diff --git a/packages/backend/src/api/__tests__/factory.test.ts b/packages/backend/src/api/__tests__/factory.test.ts
index bc73d4a207d..337581f52cb 100644
--- a/packages/backend/src/api/__tests__/factory.test.ts
+++ b/packages/backend/src/api/__tests__/factory.test.ts
@@ -59,6 +59,40 @@ describe('api.client', () => {
     expect(totalCount).toBe(2);
   });
 
+  it('executes users.getUserList() with last_sign_in_at filters', async () => {
+    const afterTimestamp = 1640000000;
+    const beforeTimestamp = 1700000000;
+
+    server.use(
+      http.get(
+        `https://api.clerk.test/v1/users`,
+        validateHeaders(({ request }) => {
+          const url = new URL(request.url);
+          expect(url.searchParams.get('last_sign_in_at_after')).toBe(afterTimestamp.toString());
+          expect(url.searchParams.get('last_sign_in_at_before')).toBe(beforeTimestamp.toString());
+          return HttpResponse.json([userJson]);
+        }),
+      ),
+      http.get(
+        `https://api.clerk.test/v1/users/count`,
+        validateHeaders(({ request }) => {
+          const url = new URL(request.url);
+          expect(url.searchParams.get('last_sign_in_at_after')).toBe(afterTimestamp.toString());
+          expect(url.searchParams.get('last_sign_in_at_before')).toBe(beforeTimestamp.toString());
+          return HttpResponse.json({ object: 'total_count', total_count: 1 });
+        }),
+      ),
+    );
+
+    const { data, totalCount } = await apiClient.users.getUserList({
+      lastSignInAtAfter: afterTimestamp,
+      lastSignInAtBefore: beforeTimestamp,
+    });
+
+    expect(data.length).toBe(1);
+    expect(totalCount).toBe(1);
+  });
+
   it('executes a successful backend API request for a paginated response', async () => {
     server.use(
       http.get(
diff --git a/packages/backend/src/api/endpoints/UserApi.ts b/packages/backend/src/api/endpoints/UserApi.ts
index 38f31670827..509b5c5d256 100644
--- a/packages/backend/src/api/endpoints/UserApi.ts
+++ b/packages/backend/src/api/endpoints/UserApi.ts
@@ -41,6 +41,8 @@ type UserListParams = ClerkPaginationRequest<
       | 'last_sign_in_at'
     >;
     last_active_at_since?: number;
+    lastSignInAtAfter?: number;
+    lastSignInAtBefore?: number;
     organizationId?: string[];
   }
 >;