diff --git a/folder_paths.py b/folder_paths.py
index ee048b0f2..5fdbacce7 100644
--- a/folder_paths.py
+++ b/folder_paths.py
@@ -58,7 +58,7 @@ folder_names_and_paths["geometry_estimation"] = ([os.path.join(models_dir, "geom
 
 folder_names_and_paths["optical_flow"] = ([os.path.join(models_dir, "optical_flow")], supported_pt_extensions)
 
-folder_names_and_paths["detection"] = ([os.path.join(models_dir, "detection")], supported_pt_extensions)
+folder_names_and_paths["detection"] = ([os.path.join(models_dir, "detection")], supported_pt_extensions | {".onnx"})
 
 output_directory = os.path.join(base_path, "output")
 temp_directory = os.path.join(base_path, "temp")
diff --git a/tests-unit/folder_paths_test/detection_onnx_extensions_test.py b/tests-unit/folder_paths_test/detection_onnx_extensions_test.py
new file mode 100644
index 000000000..093a353d3
--- /dev/null
+++ b/tests-unit/folder_paths_test/detection_onnx_extensions_test.py
@@ -0,0 +1,23 @@
+import os
+import tempfile
+
+import folder_paths
+
+
+def test_detection_folder_allows_onnx_extension():
+    _, extensions = folder_paths.folder_names_and_paths["detection"]
+    assert ".onnx" in extensions
+
+
+def test_detection_folder_lists_onnx_files():
+    with tempfile.TemporaryDirectory() as detection_dir:
+        onnx_path = os.path.join(detection_dir, "vitpose-l-wholebody.onnx")
+        with open(onnx_path, "wb") as onnx_file:
+            onnx_file.write(b"onnx")
+
+        folder_paths.add_model_folder_path("detection", detection_dir, is_default=True)
+        folder_paths.filename_list_cache.pop("detection", None)
+
+        filenames = folder_paths.get_filename_list("detection")
+        assert "vitpose-l-wholebody.onnx" in filenames
+        assert folder_paths.get_full_path("detection", "vitpose-l-wholebody.onnx") == onnx_path