diff --git a/scrapy/extensions/feedexport.py b/scrapy/extensions/feedexport.py
index c6e2aa0dd..8bcd4e40d 100644
--- a/scrapy/extensions/feedexport.py
+++ b/scrapy/extensions/feedexport.py
@@ -276,7 +276,14 @@ class S3FeedStorage(BlockingFeedStorage):
 
 
 class GCSFeedStorage(BlockingFeedStorage):
-    def __init__(self, uri: str, project_id: str | None, acl: str | None):
+    def __init__(
+        self,
+        uri: str,
+        project_id: str | None,
+        acl: str | None,
+        *,
+        feed_options: dict[str, Any] | None = None,
+    ):
         self.project_id: str | None = project_id
         self.acl: str | None = acl
         u = urlparse(uri)
@@ -284,12 +291,26 @@ class GCSFeedStorage(BlockingFeedStorage):
         self.bucket_name: str = u.hostname
         self.blob_name: str = u.path[1:]  # remove first "/"
 
+        if feed_options and feed_options.get("overwrite", True) is False:
+            logger.warning(
+                "GCS does not support appending to files. To "
+                "suppress this warning, remove the overwrite "
+                "option from your FEEDS setting or set it to True."
+            )
+
     @classmethod
-    def from_crawler(cls, crawler: Crawler, uri: str) -> Self:
+    def from_crawler(
+        cls,
+        crawler: Crawler,
+        uri: str,
+        *,
+        feed_options: dict[str, Any] | None = None,
+    ) -> Self:
         return cls(
             uri,
             crawler.settings["GCS_PROJECT_ID"],
             crawler.settings["FEED_STORAGE_GCS_ACL"] or None,
+            feed_options=feed_options,
         )
 
     def _store_in_thread(self, file: IO[bytes]) -> None:
diff --git a/tests/test_feedexport.py b/tests/test_feedexport.py
index 81d05e2a3..7edffa1f6 100644
--- a/tests/test_feedexport.py
+++ b/tests/test_feedexport.py
@@ -523,6 +523,21 @@ class GCSFeedStorageTest(unittest.TestCase):
             bucket_mock.blob.assert_called_once_with("export.csv")
             blob_mock.upload_from_file.assert_called_once_with(f, predefined_acl=acl)
 
+    def test_overwrite_default(self):
+        with LogCapture() as log:
+            GCSFeedStorage("gs://mybucket/export.csv", "myproject-123", "custom-acl")
+        self.assertNotIn("GCS does not support appending to files", str(log))
+
+    def test_overwrite_false(self):
+        with LogCapture() as log:
+            GCSFeedStorage(
+                "gs://mybucket/export.csv",
+                "myproject-123",
+                "custom-acl",
+                feed_options={"overwrite": False},
+            )
+        self.assertIn("GCS does not support appending to files", str(log))
+
 
 class StdoutFeedStorageTest(unittest.TestCase):
     @defer.inlineCallbacks