diff --git a/src/fastapi_cloud_cli/commands/deploy.py b/src/fastapi_cloud_cli/commands/deploy.py
index 89347e2..a3c8a88 100644
--- a/src/fastapi_cloud_cli/commands/deploy.py
+++ b/src/fastapi_cloud_cli/commands/deploy.py
@@ -557,12 +557,22 @@ def deploy(
     skip_wait: Annotated[
         bool, typer.Option("--no-wait", help="Skip waiting for deployment status")
     ] = False,
+    provided_app_id: Annotated[
+        Union[str, None],
+        typer.Option(
+            "--app-id",
+            help="Application ID to deploy to",
+            envvar="FASTAPI_CLOUD_APP_ID",
+        ),
+    ] = None,
 ) -> Any:
     """
     Deploy a [bold]FastAPI[/bold] app to FastAPI Cloud. 🚀
     """
     logger.debug("Deploy command started")
-    logger.debug("Deploy path: %s, skip_wait: %s", path, skip_wait)
+    logger.debug(
+        "Deploy path: %s, skip_wait: %s, app_id: %s", path, skip_wait, provided_app_id
+    )
 
     identity = Identity()
 
@@ -604,19 +614,43 @@ def deploy(
 
         app_config = get_app_config(path_to_deploy)
 
-        if not app_config:
+        if app_config and provided_app_id and app_config.app_id != provided_app_id:
+            toolkit.print(
+                f"[error]Error: Provided app ID ({provided_app_id}) does not match the local "
+                f"config ({app_config.app_id}).[/]"
+            )
+            toolkit.print_line()
+            toolkit.print(
+                "Run [bold]fastapi cloud unlink[/] to remove the local config, "
+                "or remove --app-id / unset FASTAPI_CLOUD_APP_ID to use the configured app.",
+                tag="tip",
+            )
+
+            raise typer.Exit(1) from None
+
+        if provided_app_id:
+            target_app_id = provided_app_id
+        elif app_config:
+            target_app_id = app_config.app_id
+        else:
             logger.debug("No app config found, configuring new app")
+
             app_config = _configure_app(toolkit, path_to_deploy=path_to_deploy)
             toolkit.print_line()
+
+            target_app_id = app_config.app_id
+
+        if provided_app_id:
+            toolkit.print(f"Deploying to app [blue]{target_app_id}[/blue]...")
         else:
-            logger.debug("Existing app config found, proceeding with deployment")
             toolkit.print("Deploying app...")
-            toolkit.print_line()
+
+        toolkit.print_line()
 
         with toolkit.progress("Checking app...", transient=True) as progress:
             with handle_http_errors(progress):
-                logger.debug("Checking app with ID: %s", app_config.app_id)
-                app = _get_app(app_config.app_id)
+                logger.debug("Checking app with ID: %s", target_app_id)
+                app = _get_app(target_app_id)
 
             if not app:
                 logger.debug("App not found in API")
@@ -626,10 +660,12 @@ def deploy(
 
         if not app:
             toolkit.print_line()
-            toolkit.print(
-                "If you deleted this app, you can run [bold]fastapi cloud unlink[/] to unlink the local configuration.",
-                tag="tip",
-            )
+
+            if not provided_app_id:
+                toolkit.print(
+                    "If you deleted this app, you can run [bold]fastapi cloud unlink[/] to unlink the local configuration.",
+                    tag="tip",
+                )
             raise typer.Exit(1)
 
         with tempfile.TemporaryDirectory() as temp_dir:
diff --git a/tests/test_cli_deploy.py b/tests/test_cli_deploy.py
index 8f8382b..72ea419 100644
--- a/tests/test_cli_deploy.py
+++ b/tests/test_cli_deploy.py
@@ -1216,3 +1216,188 @@ def test_deploy_with_token_fails(
             "The specified token is not valid. Make sure to use a valid token."
             in result.output
         )
+
+
+@pytest.mark.respx(base_url=settings.base_api_url)
+def test_deploy_with_app_id_arg(
+    logged_in_cli: None, tmp_path: Path, respx_mock: respx.MockRouter
+) -> None:
+    app_data = _get_random_app()
+    app_id = app_data["id"]
+    deployment_data = _get_random_deployment(app_id=app_id)
+
+    respx_mock.get(f"/apps/{app_id}").mock(return_value=Response(200, json=app_data))
+
+    respx_mock.post(f"/apps/{app_id}/deployments/").mock(
+        return_value=Response(201, json=deployment_data)
+    )
+
+    respx_mock.post(f"/deployments/{deployment_data['id']}/upload").mock(
+        return_value=Response(
+            200,
+            json={"url": "http://test.com", "fields": {"key": "value"}},
+        )
+    )
+
+    respx_mock.post("http://test.com", data={"key": "value"}).mock(
+        return_value=Response(200)
+    )
+
+    respx_mock.post(f"/deployments/{deployment_data['id']}/upload-complete").mock(
+        return_value=Response(200)
+    )
+
+    respx_mock.get(f"/deployments/{deployment_data['id']}/build-logs").mock(
+        return_value=Response(
+            200,
+            content=build_logs_response(
+                {"type": "message", "message": "Building...", "id": "1"},
+                {"type": "complete"},
+            ),
+        )
+    )
+
+    with changing_dir(tmp_path):
+        result = runner.invoke(app, ["deploy", "--app-id", app_id])
+
+        assert result.exit_code == 0
+        assert f"Deploying to app {app_id}" in result.output
+
+
+@pytest.mark.respx(base_url=settings.base_api_url)
+def test_deploy_with_app_id_from_env_var(
+    logged_in_cli: None, tmp_path: Path, respx_mock: respx.MockRouter
+) -> None:
+    app_data = _get_random_app()
+    app_id = app_data["id"]
+    deployment_data = _get_random_deployment(app_id=app_id)
+
+    respx_mock.get(f"/apps/{app_id}").mock(return_value=Response(200, json=app_data))
+
+    respx_mock.post(f"/apps/{app_id}/deployments/").mock(
+        return_value=Response(201, json=deployment_data)
+    )
+
+    respx_mock.post(f"/deployments/{deployment_data['id']}/upload").mock(
+        return_value=Response(
+            200,
+            json={"url": "http://test.com", "fields": {"key": "value"}},
+        )
+    )
+
+    respx_mock.post("http://test.com", data={"key": "value"}).mock(
+        return_value=Response(200)
+    )
+
+    respx_mock.post(f"/deployments/{deployment_data['id']}/upload-complete").mock(
+        return_value=Response(200)
+    )
+
+    respx_mock.get(f"/deployments/{deployment_data['id']}/build-logs").mock(
+        return_value=Response(
+            200,
+            content=build_logs_response(
+                {"type": "message", "message": "Building...", "id": "1"},
+                {"type": "complete"},
+            ),
+        )
+    )
+
+    with changing_dir(tmp_path):
+        result = runner.invoke(app, ["deploy"], env={"FASTAPI_CLOUD_APP_ID": app_id})
+
+        assert result.exit_code == 0
+        assert f"Deploying to app {app_id}" in result.output
+
+
+@pytest.mark.respx(base_url=settings.base_api_url)
+def test_deploy_with_app_id_matching_local_config(
+    logged_in_cli: None, tmp_path: Path, respx_mock: respx.MockRouter
+) -> None:
+    app_data = _get_random_app()
+    app_id = app_data["id"]
+    team_id = "some-team-id"
+    deployment_data = _get_random_deployment(app_id=app_id)
+
+    config_path = tmp_path / ".fastapicloud" / "cloud.json"
+    config_path.parent.mkdir(parents=True, exist_ok=True)
+    config_path.write_text(f'{{"app_id": "{app_id}", "team_id": "{team_id}"}}')
+
+    respx_mock.get(f"/apps/{app_id}").mock(return_value=Response(200, json=app_data))
+
+    respx_mock.post(f"/apps/{app_id}/deployments/").mock(
+        return_value=Response(201, json=deployment_data)
+    )
+
+    respx_mock.post(f"/deployments/{deployment_data['id']}/upload").mock(
+        return_value=Response(
+            200,
+            json={"url": "http://test.com", "fields": {"key": "value"}},
+        )
+    )
+
+    respx_mock.post("http://test.com", data={"key": "value"}).mock(
+        return_value=Response(200)
+    )
+
+    respx_mock.post(f"/deployments/{deployment_data['id']}/upload-complete").mock(
+        return_value=Response(200)
+    )
+
+    respx_mock.get(f"/deployments/{deployment_data['id']}/build-logs").mock(
+        return_value=Response(
+            200,
+            content=build_logs_response(
+                {"type": "message", "message": "Building...", "id": "1"},
+                {"type": "complete"},
+            ),
+        )
+    )
+
+    with changing_dir(tmp_path):
+        result = runner.invoke(app, ["deploy", "--app-id", app_id])
+
+        assert result.exit_code == 0
+        # Should NOT show mismatch warning
+        assert "does not match" not in result.output
+        assert f"Deploying to app {app_id}" in result.output
+
+
+@pytest.mark.respx(base_url=settings.base_api_url)
+def test_deploy_with_app_id_mismatch_fails(
+    logged_in_cli: None, tmp_path: Path, respx_mock: respx.MockRouter
+) -> None:
+    local_app_data = _get_random_app()
+    local_app_id = local_app_data["id"]
+    team_id = "some-team-id"
+
+    config_path = tmp_path / ".fastapicloud" / "cloud.json"
+    config_path.parent.mkdir(parents=True, exist_ok=True)
+    config_path.write_text(f'{{"app_id": "{local_app_id}", "team_id": "{team_id}"}}')
+
+    cli_app_id = "different-app-id"
+
+    with changing_dir(tmp_path):
+        result = runner.invoke(app, ["deploy", "--app-id", cli_app_id])
+
+        assert result.exit_code == 1
+        assert "does not match" in result.output
+        assert "fastapi cloud unlink" in result.output
+        assert "FASTAPI_CLOUD_APP_ID" in result.output
+
+
+@pytest.mark.respx(base_url=settings.base_api_url)
+def test_deploy_with_app_id_arg_app_not_found(
+    logged_in_cli: None, tmp_path: Path, respx_mock: respx.MockRouter
+) -> None:
+    app_id = "nonexistent-app-id"
+
+    respx_mock.get(f"/apps/{app_id}").mock(return_value=Response(404))
+
+    with changing_dir(tmp_path):
+        result = runner.invoke(app, ["deploy", "--app-id", app_id])
+
+        assert result.exit_code == 1
+        assert "App not found" in result.output
+        # Should NOT show unlink tip when using --app-id
+        assert "unlink" not in result.output