diff --git a/tensorrt_llm/models/convert_utils.py b/tensorrt_llm/models/convert_utils.py
index 58da3ec36349..f75234da444c 100644
--- a/tensorrt_llm/models/convert_utils.py
+++ b/tensorrt_llm/models/convert_utils.py
@@ -317,6 +317,11 @@ def load_calib_dataset(dataset_name_or_dir: str,
                     key = meta[2]
                 break
 
+    # The bare "cnn_dailymail" repo id was relocated to "abisee/cnn_dailymail";
+    # newer huggingface_hub rejects un-namespaced ids.
+    if dataset_name_or_dir == "cnn_dailymail":
+        dataset_name_or_dir = "abisee/cnn_dailymail"
+
     dataset = load_dataset(dataset_name_or_dir,
                            name=config_name,
                            split=split,
diff --git a/tests/unittest/others/test_calib_dataset_namespace.py b/tests/unittest/others/test_calib_dataset_namespace.py
new file mode 100644
index 000000000000..1188a000cf18
--- /dev/null
+++ b/tests/unittest/others/test_calib_dataset_namespace.py
@@ -0,0 +1,43 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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.
+from unittest import mock
+
+import pytest
+
+import tensorrt_llm.models.convert_utils as convert_utils
+from tensorrt_llm.models.convert_utils import load_calib_dataset
+
+
+def test_bare_cnn_dailymail_is_namespaced() -> None:
+    # Newer huggingface_hub rejects the bare "cnn_dailymail" repo id; it must
+    # be rewritten to the relocated "abisee/cnn_dailymail" (issue #15802/#16124).
+    with mock.patch.object(
+        convert_utils, "load_dataset", return_value={"article": ["x"]}
+    ) as load_dataset:
+        load_calib_dataset("cnn_dailymail")
+
+    assert load_dataset.call_args.args[0] == "abisee/cnn_dailymail"
+
+
+# ccdv/cnn_dailymail is the important boundary: the already-qualified id must
+# NOT be rewritten — only the bare "cnn_dailymail" maps to abisee/cnn_dailymail.
+@pytest.mark.parametrize("dataset_name", ["lambada", "ccdv/cnn_dailymail"])
+def test_other_dataset_ids_are_passed_through(dataset_name: str) -> None:
+    with mock.patch.object(
+        convert_utils, "load_dataset", return_value={"text": ["x"], "article": ["x"]}
+    ) as load_dataset:
+        load_calib_dataset(dataset_name)
+
+    assert load_dataset.call_args.args[0] == dataset_name