diff --git a/tests/unit/forklift/test_legacy.py b/tests/unit/forklift/test_legacy.py
index 6d25b80594f5..b6ccb10bf035 100644
--- a/tests/unit/forklift/test_legacy.py
+++ b/tests/unit/forklift/test_legacy.py
@@ -753,6 +753,25 @@ def test_is_duplicate_false(self, pyramid_config, db_request):
 
 
 class TestFileUpload:
+    def test_fails_disallow_new_upload(self, pyramid_config, pyramid_request):
+        pyramid_config.testing_securitypolicy(userid=1)
+        pyramid_request.flags = pretend.stub(
+            enabled=lambda value: value == AdminFlagValue.DISALLOW_NEW_UPLOAD
+        )
+        pyramid_request.help_url = pretend.call_recorder(lambda **kw: "/the/help/url/")
+        pyramid_request.user = pretend.stub(primary_email=pretend.stub(verified=True))
+
+        with pytest.raises(HTTPForbidden) as excinfo:
+            legacy.file_upload(pyramid_request)
+
+        resp = excinfo.value
+
+        assert resp.status_code == 403
+        assert resp.status == (
+            "403 New uploads are temporarily disabled. "
+            "See /the/help/url/ for details"
+        )
+
     @pytest.mark.parametrize("version", ["2", "3", "-1", "0", "dog", "cat"])
     def test_fails_invalid_version(self, pyramid_config, pyramid_request, version):
         pyramid_config.testing_securitypolicy(userid=1)
diff --git a/warehouse/admin/flags.py b/warehouse/admin/flags.py
index f3c580e7e6a0..fc89ea0705ea 100644
--- a/warehouse/admin/flags.py
+++ b/warehouse/admin/flags.py
@@ -18,6 +18,7 @@
 class AdminFlagValue:
     DISALLOW_DELETION = "disallow-deletion"
     DISALLOW_NEW_PROJECT_REGISTRATION = "disallow-new-project-registration"
+    DISALLOW_NEW_UPLOAD = "disallow-new-upload"
     DISALLOW_NEW_USER_REGISTRATION = "disallow-new-user-registration"
     READ_ONLY = "read-only"
 
diff --git a/warehouse/forklift/legacy.py b/warehouse/forklift/legacy.py
index c3771cc5080a..a009a30ac555 100644
--- a/warehouse/forklift/legacy.py
+++ b/warehouse/forklift/legacy.py
@@ -734,6 +734,15 @@ def file_upload(request):
             HTTPForbidden, "Read-only mode: Uploads are temporarily disabled"
         )
 
+    if request.flags.enabled(AdminFlagValue.DISALLOW_NEW_UPLOAD):
+        raise _exc_with_message(
+            HTTPForbidden,
+            "New uploads are temporarily disabled. "
+            "See {projecthelp} for details".format(
+                projecthelp=request.help_url(_anchor="admin-intervention")
+            ),
+        )
+
     # Log an attempt to upload
     metrics = request.find_service(IMetricsService, context=None)
     metrics.increment("warehouse.upload.attempt")
diff --git a/warehouse/migrations/versions/ee4c59b2ef3a_add_disallow_new_upload_adminflag.py b/warehouse/migrations/versions/ee4c59b2ef3a_add_disallow_new_upload_adminflag.py
new file mode 100644
index 000000000000..97e4d0bc7603
--- /dev/null
+++ b/warehouse/migrations/versions/ee4c59b2ef3a_add_disallow_new_upload_adminflag.py
@@ -0,0 +1,41 @@
+# 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
+#
+# http://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 disallow-new-upload AdminFlag
+
+Revision ID: ee4c59b2ef3a
+Revises: 8650482fb903
+Create Date: 2019-08-23 22:34:29.180163
+"""
+
+from alembic import op
+
+revision = "ee4c59b2ef3a"
+down_revision = "8650482fb903"
+
+
+def upgrade():
+    op.execute(
+        """
+        INSERT INTO admin_flags(id, description, enabled, notify)
+        VALUES (
+            'disallow-new-upload',
+            'Disallow ALL new uploads',
+            FALSE,
+            FALSE
+        )
+    """
+    )
+
+
+def downgrade():
+    op.execute("DELETE FROM admin_flags WHERE id = 'disallow-new-upload'")