diff --git a/samcli/lib/package/utils.py b/samcli/lib/package/utils.py
index 8cfc2f3157..21607511e6 100644
--- a/samcli/lib/package/utils.py
+++ b/samcli/lib/package/utils.py
@@ -23,7 +23,7 @@
 
 # https://docs.aws.amazon.com/AmazonS3/latest/dev-retired/UsingBucket.html
 _REGION_PATTERN = r"[a-zA-Z0-9-]+"
-_DOT_AMAZONAWS_COM_PATTERN = r"\.amazonaws\.com"
+_DOT_AMAZONAWS_COM_PATTERN = r"\.amazonaws\.com(\.cn)?"
 _S3_URL_REGEXS = [
     # Path-Style (and ipv6 dualstack)
     # - https://s3.Region.amazonaws.com/bucket-name/key name
diff --git a/tests/unit/lib/package/test_utils.py b/tests/unit/lib/package/test_utils.py
index 2907d7c479..6fe6107f76 100644
--- a/tests/unit/lib/package/test_utils.py
+++ b/tests/unit/lib/package/test_utils.py
@@ -12,13 +12,16 @@ class TestPackageUtils(TestCase):
             "https://s3.us-west-2.amazonaws.com/bucket-name/some/path/object.html",
             "http://s3.amazonaws.com/bucket-name/some/path/object.html",
             "https://s3.dualstack.us-west-2.amazonaws.com/bucket-name/some/path/object.html",
+            "https://s3.dualstack.us-west-2.amazonaws.com.cn/bucket-name/some/path/object.html",
             # virual host
             "http://bucket-name.s3.us-west-2.amazonaws.com/some/path/object.html",
             "https://bucket-name.s3-us-west-2.amazonaws.com/some/path/object.html",
             "https://bucket-name.s3.amazonaws.com/some/path/object.html",
+            "https://bucket-name.s3.amazonaws.com.cn/some/path/object.html",
             # access point
             "https://access-name-123456.s3-accesspoint.us-west-2.amazonaws.com/some/path/object.html",
             "http://access-name-899889.s3-accesspoint.us-east-1.amazonaws.com/some/path/object.html",
+            "http://access-name-899889.s3-accesspoint.us-east-1.amazonaws.com.cn/some/path/object.html",
             # s3://
             "s3://bucket-name/path/to/object",
         ]
@@ -29,6 +32,7 @@ def test_is_s3_url(self, url):
     @parameterized.expand(
         [
             # path like
+            "https://s3.$region.amazonaws.com.abc/bucket-name/some/path/object.html",  # invalid domain
             "https://s3.$region.amazonaws.com/bucket-name/some/path/object.html",  # invalid region
             "https://s3.amazonaws.com/object.html",  # no bucket
             # virual host