--- contrib/python/moto/py3/moto/s3/models.py
+++ contrib/python/moto/py3/moto/s3/models.py
@@ -561,6 +561,8 @@ def get_canned_acl(acl):
     grants = [FakeGrant([owner_grantee], [PERMISSION_FULL_CONTROL])]
     if acl == "private":
         pass  # no other permissions
+    elif acl == "public-write":
+        grants.append(FakeGrant([ALL_USERS_GRANTEE], [PERMISSION_WRITE]))
     elif acl == "public-read":
         grants.append(FakeGrant([ALL_USERS_GRANTEE], [PERMISSION_READ]))
     elif acl == "public-read-write":