diff --git a/packages/google-cloud-core/.flake8 b/packages/google-cloud-core/.flake8
index 02330e9e7402..9fa4e6584687 100644
--- a/packages/google-cloud-core/.flake8
+++ b/packages/google-cloud-core/.flake8
@@ -9,3 +9,11 @@ exclude =
   .git,
   *.pyc,
   conf.py
+# PEP 0810 lazy imports require __lazy_modules__ to precede import statements,
+# which causes flake8 to flag module-level imports as E402.
+per-file-ignores =
+    google/cloud/_helpers/__init__.py: E402
+    google/cloud/_http/__init__.py: E402
+    google/cloud/client/__init__.py: E402
+    google/cloud/exceptions/__init__.py: E402
+    google/cloud/operation/__init__.py: E402
diff --git a/packages/google-cloud-core/google/cloud/_helpers/__init__.py b/packages/google-cloud-core/google/cloud/_helpers/__init__.py
index 7a198cc9d683..44f0d457f895 100644
--- a/packages/google-cloud-core/google/cloud/_helpers/__init__.py
+++ b/packages/google-cloud-core/google/cloud/_helpers/__init__.py
@@ -25,7 +25,25 @@
 import os
 import re
 from threading import local as Local
-from typing import Union
+from typing import Set, Union
+
+# PEP 0810: Explicit Lazy Imports
+# Python 3.15+ natively intercepts and defers these imports.
+# Developers can disable this behavior and force eager imports.
+# For more information, see:
+# https://docs.python.org/3.15/library/sys.html#sys.set_lazy_imports_filter
+# Older Python versions safely ignore this variable.
+# NOTE: We statically define all modules here to ensure static analysis tools
+# (mypy, pyright, Ruff) can easily parse them. If support is not present, the
+# imports are ignored, making their presence safe.
+__lazy_modules__: Set[str] = {
+    "google.auth",
+    "google.auth.transport.grpc",
+    "google.auth.transport.requests",
+    "google.protobuf.duration_pb2",
+    "google.protobuf.timestamp_pb2",
+    "grpc",
+}
 
 import google.auth
 import google.auth.transport.requests
diff --git a/packages/google-cloud-core/google/cloud/_http/__init__.py b/packages/google-cloud-core/google/cloud/_http/__init__.py
index af25e650db6e..f04fc71c2c8f 100644
--- a/packages/google-cloud-core/google/cloud/_http/__init__.py
+++ b/packages/google-cloud-core/google/cloud/_http/__init__.py
@@ -19,10 +19,25 @@
 import json
 import os
 import platform
-from typing import Optional
+from typing import Optional, Set
 from urllib.parse import urlencode
 import warnings
 
+# PEP 0810: Explicit Lazy Imports
+# Python 3.15+ natively intercepts and defers these imports.
+# Developers can disable this behavior and force eager imports.
+# For more information, see:
+# https://docs.python.org/3.15/library/sys.html#sys.set_lazy_imports_filter
+# Older Python versions safely ignore this variable.
+# NOTE: We statically define all modules here to ensure static analysis tools
+# (mypy, pyright, Ruff) can easily parse them. If support is not present, the
+# imports are ignored, making their presence safe.
+__lazy_modules__: Set[str] = {
+    "google.api_core.client_info",
+    "google.cloud.exceptions",
+    "google.cloud.version",
+}
+
 from google.api_core.client_info import ClientInfo
 from google.cloud import exceptions
 from google.cloud import version
diff --git a/packages/google-cloud-core/google/cloud/client/__init__.py b/packages/google-cloud-core/google/cloud/client/__init__.py
index 27d1a4c3dbae..e10dd839ad0a 100644
--- a/packages/google-cloud-core/google/cloud/client/__init__.py
+++ b/packages/google-cloud-core/google/cloud/client/__init__.py
@@ -18,8 +18,29 @@
 import json
 import os
 from pickle import PicklingError
-from typing import Tuple
-from typing import Union
+from typing import Set, Tuple, Union
+
+# PEP 0810: Explicit Lazy Imports
+# Python 3.15+ natively intercepts and defers these imports.
+# Developers can disable this behavior and force eager imports.
+# For more information, see:
+# https://docs.python.org/3.15/library/sys.html#sys.set_lazy_imports_filter
+# Older Python versions safely ignore this variable.
+# NOTE: We statically define all modules here to ensure static analysis tools
+# (mypy, pyright, Ruff) can easily parse them. If support is not present, the
+# imports are ignored, making their presence safe.
+__lazy_modules__: Set[str] = {
+    "google.api_core.client_options",
+    "google.api_core.exceptions",
+    "google.auth",
+    "google.auth.api_key",
+    "google.auth.environment_vars",
+    "google.auth.credentials",
+    "google.auth.transport.requests",
+    "google.cloud._helpers",
+    "google.oauth2",
+    "google.oauth2.service_account",
+}
 
 import google.api_core.client_options
 import google.api_core.exceptions
diff --git a/packages/google-cloud-core/google/cloud/exceptions/__init__.py b/packages/google-cloud-core/google/cloud/exceptions/__init__.py
index 36ee6d14fcab..58d14a7ff929 100644
--- a/packages/google-cloud-core/google/cloud/exceptions/__init__.py
+++ b/packages/google-cloud-core/google/cloud/exceptions/__init__.py
@@ -21,6 +21,23 @@
 # Avoid the grpc and google.cloud.grpc collision.
 from __future__ import absolute_import
 
+from typing import Set
+
+# PEP 0810: Explicit Lazy Imports
+# Python 3.15+ natively intercepts and defers these imports.
+# Developers can disable this behavior and force eager imports.
+# For more information, see:
+# https://docs.python.org/3.15/library/sys.html#sys.set_lazy_imports_filter
+# Older Python versions safely ignore this variable.
+# NOTE: We statically define all modules here to ensure static analysis tools
+# (mypy, pyright, Ruff) can easily parse them. If support is not present, the
+# imports are ignored, making their presence safe.
+__lazy_modules__: Set[str] = {
+    "google.api_core.exceptions",
+    "grpc",
+    "grpc._channel",
+}
+
 from google.api_core import exceptions
 
 try:
diff --git a/packages/google-cloud-core/google/cloud/operation/__init__.py b/packages/google-cloud-core/google/cloud/operation/__init__.py
index 4fd1f271a1d4..b3ce4da0da0e 100644
--- a/packages/google-cloud-core/google/cloud/operation/__init__.py
+++ b/packages/google-cloud-core/google/cloud/operation/__init__.py
@@ -14,7 +14,23 @@
 
 """Wrap long-running operations returned from Google Cloud APIs."""
 
-from typing import Dict
+from typing import Dict, Set
+
+# PEP 0810: Explicit Lazy Imports
+# Python 3.15+ natively intercepts and defers these imports.
+# Developers can disable this behavior and force eager imports.
+# For more information, see:
+# https://docs.python.org/3.15/library/sys.html#sys.set_lazy_imports_filter
+# Older Python versions safely ignore this variable.
+# NOTE: We statically define all modules here to ensure static analysis tools
+# (mypy, pyright, Ruff) can easily parse them. If support is not present, the
+# imports are ignored, making their presence safe.
+__lazy_modules__: Set[str] = {
+    "google.longrunning",
+    "google.longrunning.operations_pb2",
+    "google.protobuf",
+    "google.protobuf.json_format",
+}
 
 from google.longrunning import operations_pb2
 from google.protobuf import json_format