diff --git a/smart_open/gcs.py b/smart_open/gcs.py
index dc0e5042..4b105528 100644
--- a/smart_open/gcs.py
+++ b/smart_open/gcs.py
@@ -15,6 +15,7 @@
     import google.cloud.exceptions
     import google.cloud.storage
     import google.auth.transport.requests
+    _PREDEFINED_ACL_SUPPORTED = google.cloud.storage.__version__.split('.') >= ['2', '6']
 except ImportError:
     MISSING_DEPS = True
 
@@ -420,14 +421,20 @@ def __init__(
 
         self._session = google.auth.transport.requests.AuthorizedSession(client._credentials)
 
+        upload_kwargs = {}
+
         if blob_properties:
+            if 'predefined_acl' in blob_properties:
+                upload_kwargs['predefined_acl'] = blob_properties.pop('predefined_acl')
             for k, v in blob_properties.items():
                 setattr(self._blob, k, v)
 
+        if 'predefined_acl' in upload_kwargs and not _PREDEFINED_ACL_SUPPORTED:
+            raise NotImplementedError('GCS "predefined_acl" requires google-cloud-storage>=2.6.0')
         #
         # https://cloud.google.com/storage/docs/json_api/v1/how-tos/resumable-upload#start-resumable
         #
-        self._resumable_upload_url = self._blob.create_resumable_upload_session()
+        self._resumable_upload_url = self._blob.create_resumable_upload_session(**upload_kwargs)
 
         #
         # This member is part of the io.BufferedIOBase interface.
diff --git a/smart_open/tests/test_gcs.py b/smart_open/tests/test_gcs.py
index 22eb7f40..451db59d 100644
--- a/smart_open/tests/test_gcs.py
+++ b/smart_open/tests/test_gcs.py
@@ -142,12 +142,13 @@ def __init__(self, name, bucket):
 
         self._create_if_not_exists()
 
-    def create_resumable_upload_session(self):
+    def create_resumable_upload_session(self, predefined_acl=None):
         resumeable_upload_url = RESUMABLE_SESSION_URI_TEMPLATE % dict(
             bucket=self._bucket.name,
             upload_id=str(uuid.uuid4()),
         )
         upload = FakeBlobUpload(resumeable_upload_url, self)
+        self.acl = predefined_acl
         self._bucket.register_upload(upload)
         return resumeable_upload_url
 
@@ -807,12 +808,14 @@ def test_write_05(self):
         smart_open_write = smart_open.gcs.Writer(BUCKET_NAME, WRITE_BLOB_NAME,
             blob_properties={
                 "content_type": "random/x-test",
-                "content_encoding": "coded"
+                "content_encoding": "coded",
+                "predefined_acl": "publicRead"
             }
         )
         with smart_open_write as fout:  # noqa
             assert fout._blob.content_type == "random/x-test"
             assert fout._blob.content_encoding == "coded"
+            assert fout._blob.acl == "publicRead"
 
     def test_gzip(self):
         expected = u'а не спеть ли мне песню... о любви'.encode('utf-8')