diff --git a/packages/reflex-hosting-cli/src/reflex_cli/v2/gcp.py b/packages/reflex-hosting-cli/src/reflex_cli/v2/gcp.py
index 755b3410831..68687f8dcc9 100644
--- a/packages/reflex-hosting-cli/src/reflex_cli/v2/gcp.py
+++ b/packages/reflex-hosting-cli/src/reflex_cli/v2/gcp.py
@@ -7,7 +7,7 @@
 tree is never modified. The script reads its parameters from environment
 variables (GCP_PROJECT, GCP_REGION, SERVICE_NAME, AR_REPO, VERSION,
 CLOUD_RUN_CPU, CLOUD_RUN_MEMORY, CLOUD_RUN_MIN_INSTANCES,
-REFLEX_CLOUDBUILD_YAML).
+CLOUD_RUN_SERVICE_ACCOUNT, REFLEX_CLOUDBUILD_YAML).
 """
 
 from __future__ import annotations
@@ -41,6 +41,7 @@
 ENV_CPU = "CLOUD_RUN_CPU"
 ENV_MEMORY = "CLOUD_RUN_MEMORY"
 ENV_MIN_INSTANCES = "CLOUD_RUN_MIN_INSTANCES"
+ENV_SERVICE_ACCOUNT = "CLOUD_RUN_SERVICE_ACCOUNT"
 # Path to the Cloud Build config file written by the CLI. The rewritten
 # deploy script references it as ``--config="${REFLEX_CLOUDBUILD_YAML}"``.
 ENV_REFLEX_CLOUDBUILD_YAML = "REFLEX_CLOUDBUILD_YAML"
@@ -162,6 +163,12 @@
     type=click.IntRange(min=0),
     help="Minimum number of Cloud Run instances to keep warm (sets CLOUD_RUN_MIN_INSTANCES). Set to 0 to scale to zero.",
 )
+@click.option(
+    "--service-account",
+    "service_account",
+    default=None,
+    help="IAM service account email the Cloud Run service runs as (sets CLOUD_RUN_SERVICE_ACCOUNT). If omitted, Cloud Run uses the project's default compute SA. The deploying principal needs roles/iam.serviceAccountUser on the target SA.",
+)
 @click.option(
     "--source",
     "source_dir",
@@ -199,6 +206,7 @@ def deploy_command(
     cpu: str,
     memory: str,
     min_instances: int,
+    service_account: str | None,
     source_dir: str,
     token: str | None,
     interactive: bool,
@@ -285,6 +293,8 @@ def deploy_command(
         ENV_MEMORY: memory,
         ENV_MIN_INSTANCES: str(min_instances),
     }
+    if service_account:
+        deploy_env[ENV_SERVICE_ACCOUNT] = service_account
 
     console.info("Received deploy manifest from Reflex.")
     console.print("")
diff --git a/tests/units/reflex_cli/v2/test_gcp.py b/tests/units/reflex_cli/v2/test_gcp.py
index 8109504133f..da84f523b01 100644
--- a/tests/units/reflex_cli/v2/test_gcp.py
+++ b/tests/units/reflex_cli/v2/test_gcp.py
@@ -206,6 +206,56 @@ def test_gcp_deploy_resource_flags_have_defaults(mocker: MockFixture, tmp_path:
     assert env_overrides["CLOUD_RUN_MIN_INSTANCES"] == "1"
 
 
+def test_gcp_deploy_forwards_service_account(mocker: MockFixture, tmp_path: Path):
+    """--service-account threads through to CLOUD_RUN_SERVICE_ACCOUNT."""
+    run_mock = _patch_environment(mocker)
+    _mock_manifest_response(mocker)
+
+    result = runner.invoke(
+        hosting_cli,
+        [
+            "deploy",
+            "--gcp",
+            "--gcp-project",
+            "p",
+            "--source",
+            str(tmp_path),
+            "--service-account",
+            "my-sa@p.iam.gserviceaccount.com",
+        ],
+        input="y\n",
+    )
+
+    assert result.exit_code == 0, result.output
+    env_overrides = run_mock.call_args.kwargs["env_overrides"]
+    assert (
+        env_overrides["CLOUD_RUN_SERVICE_ACCOUNT"] == "my-sa@p.iam.gserviceaccount.com"
+    )
+
+
+def test_gcp_deploy_omits_service_account_when_unset(
+    mocker: MockFixture, tmp_path: Path
+):
+    """Without --service-account, CLOUD_RUN_SERVICE_ACCOUNT is not in env_overrides.
+
+    The deploy script defaults it to empty, so Cloud Run falls back to the
+    project's default compute SA. Leaving the key out of env_overrides (rather
+    than sending an empty string) keeps the dry-run output tidy.
+    """
+    run_mock = _patch_environment(mocker)
+    _mock_manifest_response(mocker)
+
+    result = runner.invoke(
+        hosting_cli,
+        ["deploy", "--gcp", "--gcp-project", "p", "--source", str(tmp_path)],
+        input="y\n",
+    )
+
+    assert result.exit_code == 0, result.output
+    env_overrides = run_mock.call_args.kwargs["env_overrides"]
+    assert "CLOUD_RUN_SERVICE_ACCOUNT" not in env_overrides
+
+
 def test_gcp_deploy_rejects_negative_min_instances(mocker: MockFixture, tmp_path: Path):
     """--min-instances is IntRange(min=0); negative values fail at the CLI layer."""
     run_mock = _patch_environment(mocker)