diff --git a/cmake/GoogleCloudCppFeatures.cmake b/cmake/GoogleCloudCppFeatures.cmake
index 19d0ff5cd2e02..2360cdbf67f33 100644
--- a/cmake/GoogleCloudCppFeatures.cmake
+++ b/cmake/GoogleCloudCppFeatures.cmake
@@ -428,6 +428,13 @@ function (google_cloud_cpp_enable_features)
                 )
                 continue()
             endif ()
+            if (IS_DIRECTORY
+                "${PROJECT_SOURCE_DIR}/protos/google/cloud/${feature}"
+                AND EXISTS
+                    "${PROJECT_SOURCE_DIR}/protos/google/cloud/${feature}/CMakeLists.txt"
+            )
+                add_subdirectory(protos/google/cloud/${feature})
+            endif ()
             add_subdirectory(google/cloud/${feature})
             if (GOOGLE_CLOUD_CPP_ENABLE_EXAMPLES
                 AND IS_DIRECTORY
diff --git a/google/cloud/storage/tests/BUILD.bazel b/google/cloud/storage/tests/BUILD.bazel
index 6ce3f7f5dc568..bba8539a4a130 100644
--- a/google/cloud/storage/tests/BUILD.bazel
+++ b/google/cloud/storage/tests/BUILD.bazel
@@ -21,19 +21,6 @@ package(default_visibility = ["//visibility:private"])
 
 licenses(["notice"])  # Apache 2.0
 
-proto_library(
-    name = "storage_conformance_tests_proto",
-    srcs = [
-        "conformance_tests.proto",
-    ],
-    deps = ["@com_google_protobuf//:timestamp_proto"],
-)
-
-cc_proto_library(
-    name = "storage_conformance_tests_cc_proto",
-    deps = [":storage_conformance_tests_proto"],
-)
-
 VARIATIONS = {
     "default": {"GOOGLE_CLOUD_CPP_STORAGE_GRPC_CONFIG": "none"},
     "grpc-metadata": {"GOOGLE_CLOUD_CPP_STORAGE_GRPC_CONFIG": "metadata"},
@@ -56,12 +43,13 @@ VARIATIONS = {
         "integration-test-" + v_label,
     ] + (["integration-test-gha"] if test.startswith("smoke_test") else []),
     deps = [
-        ":storage_conformance_tests_cc_proto",
         "//:common",
         "//:storage",
         "//google/cloud/storage:storage_client_testing",
         "//google/cloud/testing_util:google_cloud_cpp_testing_grpc_private",
         "//google/cloud/testing_util:google_cloud_cpp_testing_private",
+        "//protos:system_includes",
+        "//protos/google/cloud/storage/tests:storage_conformance_tests_cc_proto",
         "@com_google_absl//absl/strings",
         "@com_google_googletest//:gtest_main",
     ],
diff --git a/google/cloud/storage/tests/CMakeLists.txt b/google/cloud/storage/tests/CMakeLists.txt
index e6cbab3a9ae2d..538795b60a168 100644
--- a/google/cloud/storage/tests/CMakeLists.txt
+++ b/google/cloud/storage/tests/CMakeLists.txt
@@ -84,16 +84,6 @@ export_list_to_bazel(
     "storage_client_integration_tests.bzl" "storage_client_integration_tests"
     "storage_client_integration_tests_production" YEAR "2018")
 
-# Signed URL conformance tests are parsed using protos. In order to simplify the
-# build files, only build these conformance tests if gRPC in GCS is compiled.
-if (GOOGLE_CLOUD_CPP_STORAGE_ENABLE_GRPC)
-    # We need to disable clang tidy for the generated CC files.
-    google_cloud_cpp_proto_library(
-        google_cloud_cpp_storage_tests_conformance_protos
-        conformance_tests.proto PROTO_PATH_DIRECTORIES
-        ${CMAKE_CURRENT_SOURCE_DIR})
-endif ()
-
 foreach (fname IN LISTS storage_client_integration_tests)
     google_cloud_cpp_add_executable(target "storage" "${fname}")
     target_link_libraries(
diff --git a/google/cloud/storage/tests/signed_url_conformance_test.cc b/google/cloud/storage/tests/signed_url_conformance_test.cc
index 429a8da4ffdae..7f14085984059 100644
--- a/google/cloud/storage/tests/signed_url_conformance_test.cc
+++ b/google/cloud/storage/tests/signed_url_conformance_test.cc
@@ -18,13 +18,13 @@
 #include "google/cloud/storage/internal/base64.h"
 #include "google/cloud/storage/internal/signed_url_requests.h"
 #include "google/cloud/storage/list_objects_reader.h"
-#include "google/cloud/storage/tests/conformance_tests.pb.h"
 #include "google/cloud/internal/format_time_point.h"
 #include "google/cloud/internal/getenv.h"
 #include "google/cloud/internal/time_utils.h"
 #include "google/cloud/terminate_handler.h"
 #include "google/cloud/testing_util/scoped_environment.h"
 #include "google/cloud/testing_util/status_matchers.h"
+#include <google/cloud/storage/tests/conformance_tests.pb.h>
 #include <google/protobuf/util/json_util.h>
 #include <gmock/gmock.h>
 #include <algorithm>
diff --git a/protos/BUILD.bazel b/protos/BUILD.bazel
index b55abb27530ee..49a23f30a4ce3 100644
--- a/protos/BUILD.bazel
+++ b/protos/BUILD.bazel
@@ -19,5 +19,8 @@ licenses(["notice"])  # Apache 2.0
 cc_library(
     name = "system_includes",
     includes = ["."],
-    visibility = ["//google/cloud/compute:__pkg__"],
+    visibility = [
+        "//google/cloud/compute:__pkg__",
+        "//google/cloud/storage/tests:__pkg__",
+    ],
 )
diff --git a/protos/google/cloud/storage/CMakeLists.txt b/protos/google/cloud/storage/CMakeLists.txt
new file mode 100644
index 0000000000000..9b320e6d52840
--- /dev/null
+++ b/protos/google/cloud/storage/CMakeLists.txt
@@ -0,0 +1,15 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+add_subdirectory(tests)
diff --git a/protos/google/cloud/storage/tests/BUILD.bazel b/protos/google/cloud/storage/tests/BUILD.bazel
new file mode 100644
index 0000000000000..f3f70add7cbf2
--- /dev/null
+++ b/protos/google/cloud/storage/tests/BUILD.bazel
@@ -0,0 +1,33 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+package(default_visibility = ["//visibility:private"])
+
+licenses(["notice"])  # Apache 2.0
+
+proto_library(
+    name = "storage_conformance_tests_proto",
+    srcs = [
+        "conformance_tests.proto",
+    ],
+    deps = ["@com_google_protobuf//:timestamp_proto"],
+)
+
+cc_proto_library(
+    name = "storage_conformance_tests_cc_proto",
+    visibility = [
+        "//google/cloud/storage/tests:__pkg__",
+    ],
+    deps = [":storage_conformance_tests_proto"],
+)
diff --git a/protos/google/cloud/storage/tests/CMakeLists.txt b/protos/google/cloud/storage/tests/CMakeLists.txt
new file mode 100644
index 0000000000000..d09e64c33919c
--- /dev/null
+++ b/protos/google/cloud/storage/tests/CMakeLists.txt
@@ -0,0 +1,49 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+# Signed URL conformance tests are parsed using protos. In order to simplify the
+# build files, only build these conformance tests if gRPC in GCS is compiled.
+if ((NOT GOOGLE_CLOUD_CPP_STORAGE_ENABLE_GRPC) OR (NOT BUILD_TESTING))
+    return()
+endif ()
+
+include(GoogleCloudCppCommon)
+find_package(Protobuf CONFIG QUIET)
+if (NOT Protobuf_FOUND)
+    find_package(Protobuf REQUIRED)
+endif ()
+
+# Generate protobuf code and library
+if (COMMAND protobuf_generate)
+    set(protobuf_PROTOC_EXE ${Protobuf_PROTOC_EXECUTABLE})
+    add_library(google_cloud_cpp_storage_tests_conformance_protos)
+    protobuf_generate(
+        LANGUAGE cpp TARGET google_cloud_cpp_storage_tests_conformance_protos
+        PROTOS conformance_tests.proto)
+elseif (COMMAND protobuf_generate_cpp)
+    protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS conformance_tests.proto)
+    add_library(google_cloud_cpp_storage_tests_conformance_protos ${PROTO_HDRS}
+                                                                  ${PROTO_SRCS})
+else ()
+    message(FATAL_ERROR "Missing protobuf_generate_cpp and protobuf_generate")
+endif ()
+
+target_link_libraries(google_cloud_cpp_storage_tests_conformance_protos
+                      PUBLIC protobuf::libprotobuf)
+target_include_directories(google_cloud_cpp_storage_tests_conformance_protos
+                           SYSTEM PUBLIC "${PROJECT_BINARY_DIR}/protos")
+google_cloud_cpp_add_common_options(
+    google_cloud_cpp_storage_tests_conformance_protos NO_WARNINGS)
+set_target_properties(google_cloud_cpp_storage_tests_conformance_protos
+                      PROPERTIES CXX_CLANG_TIDY "")
diff --git a/google/cloud/storage/tests/conformance_tests.proto b/protos/google/cloud/storage/tests/conformance_tests.proto
similarity index 100%
rename from google/cloud/storage/tests/conformance_tests.proto
rename to protos/google/cloud/storage/tests/conformance_tests.proto