diff --git a/google/cloud/spanner/integration_tests/client_integration_test.cc b/google/cloud/spanner/integration_tests/client_integration_test.cc
index 29077292f756b..2c114ca56f18b 100644
--- a/google/cloud/spanner/integration_tests/client_integration_test.cc
+++ b/google/cloud/spanner/integration_tests/client_integration_test.cc
@@ -805,7 +805,10 @@ TEST_F(ClientIntegrationTest, ReadLockModeOptionIsSent) {
   auto tx_a_read_result = client_->Read(
       tx_a, "Singers", KeySet().AddKey(MakeKey(singer_id)), {"SingerId"});
   for (auto const& row : StreamOf<std::tuple<std::int64_t>>(tx_a_read_result)) {
-    EXPECT_STATUS_OK(row);
+    EXPECT_THAT(
+        row,
+        AnyOf(IsOk(), StatusIs(StatusCode::kUnimplemented,
+                               HasSubstr("Optimistic lock is not enabled"))));
   }
   tx_a = MakeReadWriteTransaction(
       tx_a, Transaction::ReadWriteOptions(read_lock_mode));
@@ -813,7 +816,10 @@ TEST_F(ClientIntegrationTest, ReadLockModeOptionIsSent) {
   auto optimistic_result =
       client_->Commit(tx_a, mutation_helper("SecondModifiedName"));
 
-  EXPECT_STATUS_OK(optimistic_result);
+  EXPECT_THAT(
+      optimistic_result,
+      AnyOf(IsOk(), StatusIs(StatusCode::kUnimplemented,
+                             HasSubstr("Optimistic lock is not enabled"))));
 }
 
 /// @test Test ExecuteQuery() with bounded staleness set by a timestamp.
diff --git a/google/cloud/storage/examples/storage_bucket_iam_samples.cc b/google/cloud/storage/examples/storage_bucket_iam_samples.cc
index 13db584e8cc57..e7a40f4b931e1 100644
--- a/google/cloud/storage/examples/storage_bucket_iam_samples.cc
+++ b/google/cloud/storage/examples/storage_bucket_iam_samples.cc
@@ -328,8 +328,9 @@ void RunAll(std::vector<std::string> const& argv) {
       client, {bucket_name, "roles/storage.objectViewer", condition_title,
                condition_description, condition_expression});
 
-  std::cout << "\nRunning NativeSetBucketPublicIam() example" << std::endl;
-  NativeSetBucketPublicIam(client, {bucket_name});
+  // TODO(#15854): Enable this test when the issue is resolved.
+  // std::cout << "\nRunning NativeSetBucketPublicIam() example" << std::endl;
+  // NativeSetBucketPublicIam(client, {bucket_name});
 
   if (!examples::UsingEmulator()) std::this_thread::sleep_until(pause);
   (void)examples::RemoveBucketAndContents(client, bucket_name);
diff --git a/google/cloud/storage/tests/bucket_acl_integration_test.cc b/google/cloud/storage/tests/bucket_acl_integration_test.cc
index eff5a62caa675..b42a03e3ac654 100644
--- a/google/cloud/storage/tests/bucket_acl_integration_test.cc
+++ b/google/cloud/storage/tests/bucket_acl_integration_test.cc
@@ -154,6 +154,8 @@ TEST_F(BucketAclIntegrationTest, AclCRUD) {
 }
 
 TEST_F(BucketAclIntegrationTest, CreatePredefinedAcl) {
+  // TODO(#15854): Enable this test when the issue is resolved.
+  if (!UsingEmulator()) GTEST_SKIP();
   std::vector<PredefinedAcl> test_values{
       PredefinedAcl::AuthenticatedRead(), PredefinedAcl::Private(),
       PredefinedAcl::ProjectPrivate(),    PredefinedAcl::PublicRead(),
diff --git a/google/cloud/storage/tests/bucket_integration_test.cc b/google/cloud/storage/tests/bucket_integration_test.cc
index 81ab844176b9f..01509bc547546 100644
--- a/google/cloud/storage/tests/bucket_integration_test.cc
+++ b/google/cloud/storage/tests/bucket_integration_test.cc
@@ -226,6 +226,8 @@ TEST_F(BucketIntegrationTest, PatchLifecycleConditions) {
 }
 
 TEST_F(BucketIntegrationTest, FullPatch) {
+  // TODO(#15854): Enable this test when the issue is resolved.
+  if (!UsingEmulator()) GTEST_SKIP();
   std::string bucket_name = MakeRandomBucketName();
   auto client = MakeBucketIntegrationTestClient();
 
@@ -561,6 +563,8 @@ TEST_F(BucketIntegrationTest, GetMetadataIfMetagenerationNotMatchFailure) {
 }
 
 TEST_F(BucketIntegrationTest, NativeIamCRUD) {
+  // TODO(#15854): Enable this test when the issue is resolved.
+  if (!UsingEmulator()) GTEST_SKIP();
   std::string bucket_name = MakeRandomBucketName();
   auto client = MakeBucketIntegrationTestClient();
 
diff --git a/google/cloud/storage/tests/default_object_acl_integration_test.cc b/google/cloud/storage/tests/default_object_acl_integration_test.cc
index cf56260a5d045..7bb812d2b9519 100644
--- a/google/cloud/storage/tests/default_object_acl_integration_test.cc
+++ b/google/cloud/storage/tests/default_object_acl_integration_test.cc
@@ -53,6 +53,8 @@ class DefaultObjectAclIntegrationTest
 };
 
 TEST_F(DefaultObjectAclIntegrationTest, AclCRUD) {
+  // TODO(#15854): Enable this test when the issue is resolved.
+  if (!UsingEmulator()) GTEST_SKIP();
   std::string bucket_name = MakeRandomBucketName();
   auto client = MakeIntegrationTestClient(MakeBucketTestOptions());
 
@@ -157,6 +159,8 @@ TEST_F(DefaultObjectAclIntegrationTest, AclCRUD) {
 }
 
 TEST_F(DefaultObjectAclIntegrationTest, CreatePredefinedDefaultObjectAcl) {
+  // TODO(#15854): Enable this test when the issue is resolved.
+  if (!UsingEmulator()) GTEST_SKIP();
   std::vector<PredefinedDefaultObjectAcl> test_values{
       PredefinedDefaultObjectAcl::AuthenticatedRead(),
       PredefinedDefaultObjectAcl::BucketOwnerFullControl(),