diff --git a/ci/cloudbuild/builds/lib/universe_domain.sh b/ci/cloudbuild/builds/lib/universe_domain.sh
index 3ee0ec130f802..306c0d5de4f1e 100644
--- a/ci/cloudbuild/builds/lib/universe_domain.sh
+++ b/ci/cloudbuild/builds/lib/universe_domain.sh
@@ -32,6 +32,16 @@ if [[ -n "${UD_SERVICE_ACCOUNT}" ]]; then
   io::log "Created SA key file ${UD_SA_KEY_FILE}"
 fi
 
+# Only create the IdToken SA key file if the secret is available.
+if [[ -n "${UD_IDTOKEN_SA_IMPERSONATION_CRED}" ]]; then
+  ORIG_UMASK=$(umask)
+  umask 077
+  UD_IDTOKEN_SA_KEY_FILE=$(mktemp)
+  echo "${UD_IDTOKEN_SA_IMPERSONATION_CRED}" >"${UD_IDTOKEN_SA_KEY_FILE}"
+  umask "${ORIG_UMASK}"
+  io::log "Created IdToken SA key file ${UD_IDTOKEN_SA_KEY_FILE}"
+fi
+
 function ud::bazel_run() {
   io::log "Executing bazel run $1 with obscured arguments:"
   bazel run --ui_event_filters=-info -- "$@"
@@ -45,5 +55,6 @@ function ud::bazel_test() {
     --test_env=UD_REGION="${UD_REGION}" \
     --test_env=UD_ZONE="${UD_ZONE}" \
     --test_env=UD_IMPERSONATED_SERVICE_ACCOUNT_NAME="${UD_IMPERSONATED_SERVICE_ACCOUNT_NAME}" \
+    --test_env=UD_IDTOKEN_SA_KEY_FILE="${UD_IDTOKEN_SA_KEY_FILE}" \
     --test_env=UD_PROJECT="${UD_PROJECT}" -- "$@"
 }
diff --git a/ci/cloudbuild/cloudbuild.yaml b/ci/cloudbuild/cloudbuild.yaml
index db20831188f05..1355a6260b866 100644
--- a/ci/cloudbuild/cloudbuild.yaml
+++ b/ci/cloudbuild/cloudbuild.yaml
@@ -78,6 +78,8 @@ availableSecrets:
     env: 'UD_SERVICE_ACCOUNT_NAME'
   - versionName: 'projects/${PROJECT_ID}/secrets/UD_IMPERSONATED_SERVICE_ACCOUNT_NAME/versions/latest'
     env: 'UD_IMPERSONATED_SERVICE_ACCOUNT_NAME'
+  - versionName: 'projects/${PROJECT_ID}/secrets/UD_IDTOKEN_SA_IMPERSONATION_CRED/versions/latest'
+    env: 'UD_IDTOKEN_SA_IMPERSONATION_CRED'
 
 logsBucket: 'gs://${_LOGS_BUCKET}/logs/google-cloud-cpp/${_TRIGGER_SOURCE}/${COMMIT_SHA}/${_DISTRO}-${_BUILD_NAME}-${_SHARD}'
 
@@ -115,7 +117,7 @@ steps:
 - name: '${_POOL_REGION}-docker.pkg.dev/${PROJECT_ID}/gcb/${_IMAGE}:${BUILD_ID}'
   entrypoint: 'ci/cloudbuild/build.sh'
   args: [ '--local', '--build', '${_BUILD_NAME}' ]
-  secretEnv: ['CODECOV_TOKEN', 'UD', 'UD_PROJECT', 'UD_REGION', 'UD_ZONE', 'UD_SERVICE_ACCOUNT', 'UD_SERVICE_ACCOUNT_NAME', 'UD_IMPERSONATED_SERVICE_ACCOUNT_NAME']
+  secretEnv: ['CODECOV_TOKEN', 'UD', 'UD_PROJECT', 'UD_REGION', 'UD_ZONE', 'UD_SERVICE_ACCOUNT', 'UD_SERVICE_ACCOUNT_NAME', 'UD_IMPERSONATED_SERVICE_ACCOUNT_NAME', 'UD_IDTOKEN_SA_IMPERSONATION_CRED']
   env: [
     'BAZEL_REMOTE_CACHE=https://storage.googleapis.com/${_CACHE_BUCKET}/bazel-cache/${_DISTRO}-${_BUILD_NAME}',
     'LIBRARIES=${_LIBRARIES}',
diff --git a/google/cloud/universe_domain/integration_tests/impersonation_tests.cc b/google/cloud/universe_domain/integration_tests/impersonation_tests.cc
index de766e76e59a6..9cb078a47bc07 100644
--- a/google/cloud/universe_domain/integration_tests/impersonation_tests.cc
+++ b/google/cloud/universe_domain/integration_tests/impersonation_tests.cc
@@ -20,6 +20,7 @@
 #include "google/cloud/internal/rest_options.h"
 #include "google/cloud/location.h"
 #include "google/cloud/testing_util/integration_test.h"
+#include "google/cloud/testing_util/scoped_environment.h"
 #include "google/cloud/testing_util/status_matchers.h"
 #include "google/cloud/universe_domain.h"
 #include "google/cloud/universe_domain_options.h"
@@ -33,6 +34,7 @@ GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_BEGIN
 namespace {
 
 namespace gc = ::google::cloud;
+using ::google::cloud::testing_util::ScopedEnvironment;
 using ::google::cloud::testing_util::StatusIs;
 
 class DomainUniverseImpersonationTest
@@ -45,27 +47,42 @@ class DomainUniverseImpersonationTest
     ASSERT_FALSE(zone_id_.empty());
     region_id_ = gc::internal::GetEnv("UD_REGION").value_or("");
     ASSERT_FALSE(region_id_.empty());
+  }
+
+  std::string project_id_;
+  std::string zone_id_;
+  std::string region_id_;
+};
+
+class ServiceAccountImpersonationTest : public DomainUniverseImpersonationTest {
+ protected:
+  void SetUp() override {
+    DomainUniverseImpersonationTest::SetUp();
+
     impersonated_sa_ =
         gc::internal::GetEnv("UD_IMPERSONATED_SERVICE_ACCOUNT_NAME")
             .value_or("");
     ASSERT_FALSE(impersonated_sa_.empty());
-    std::string const sa_key_file =
+
+    std::string const key_file =
         gc::internal::GetEnv("UD_SA_KEY_FILE").value_or("");
-    ASSERT_FALSE(sa_key_file.empty());
+    ASSERT_FALSE(key_file.empty());
 
-    auto is = std::ifstream(sa_key_file);
+    auto is = std::ifstream(key_file);
     is.exceptions(std::ios::badbit);
     credential_ = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
+
+    id_token_key_file_ =
+        gc::internal::GetEnv("UD_IDTOKEN_SA_KEY_FILE").value_or("");
+    ASSERT_FALSE(id_token_key_file_.empty());
   }
 
-  std::string project_id_;
-  std::string zone_id_;
-  std::string region_id_;
   std::string impersonated_sa_;
   std::string credential_;
+  std::string id_token_key_file_;
 };
 
-TEST_F(DomainUniverseImpersonationTest, SAToSAImpersonationRest) {
+TEST_F(ServiceAccountImpersonationTest, SAToSAImpersonationRest) {
   namespace disks = ::google::cloud::compute_disks_v1;
 
   gc::Options options;
@@ -84,7 +101,7 @@ TEST_F(DomainUniverseImpersonationTest, SAToSAImpersonationRest) {
   }
 }
 
-TEST_F(DomainUniverseImpersonationTest, SAToSAImpersonationGrpc) {
+TEST_F(ServiceAccountImpersonationTest, SAToSAImpersonationGrpc) {
   namespace kms = ::google::cloud::kms_v1;
 
   auto const location = gc::Location(project_id_, region_id_);
@@ -105,6 +122,21 @@ TEST_F(DomainUniverseImpersonationTest, SAToSAImpersonationGrpc) {
   }
 }
 
+TEST_F(ServiceAccountImpersonationTest, IdTokenSAToSAImpersonationRest) {
+  namespace disks = ::google::cloud::compute_disks_v1;
+  // Use ADC credential
+  ScopedEnvironment env("GOOGLE_APPLICATION_CREDENTIALS", id_token_key_file_);
+
+  auto ud_options = gc::AddUniverseDomainOption(gc::ExperimentalTag{});
+  ASSERT_STATUS_OK(ud_options);
+
+  auto client = disks::DisksClient(disks::MakeDisksConnectionRest(*ud_options));
+
+  for (auto disk : client.ListDisks(project_id_, zone_id_)) {
+    EXPECT_STATUS_OK(disk);
+  }
+}
+
 }  // namespace
 GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_END
 }  // namespace universe_domain