diff --git a/lib/ansible/config/manager.py b/lib/ansible/config/manager.py
index cf67f53a65a..4f02c3be145 100644
--- a/lib/ansible/config/manager.py
+++ b/lib/ansible/config/manager.py
@@ -705,6 +705,17 @@ class ConfigManager:
         else:
             raise AnsibleUndefinedConfigEntry(f'No config definition exists for {_get_config_label(plugin_type, plugin_name, config)}.')
 
+        if config == "GALAXY_RETRY_HTTP_ERROR_CODES":
+            try:
+                for i in range(0, len(value)):
+                    http_error_code = int(value[i])
+                    if http_error_code < 100 or http_error_code > 999:
+                        raise ValueError(f"{http_error_code} must be between 100-999")
+                    value[i] = http_error_code
+            except ValueError:
+                raise AnsibleOptionsError(f'Invalid value {value!r} for config {_get_config_label(plugin_type, plugin_name, config)}.',
+                                          help_text='Valid values are 3-digit numbers.')
+
         if not _tags.Origin.is_tagged_on(value):
             value = _tags.Origin(description=f'<Config {origin}>').tag(value)
 
diff --git a/test/units/config/test_manager.py b/test/units/config/test_manager.py
index 3bd8f05a3d2..0339c83e167 100644
--- a/test/units/config/test_manager.py
+++ b/test/units/config/test_manager.py
@@ -300,3 +300,20 @@ def test_config_trust_from_file(tmp_path: pathlib.Path) -> None:
     assert origin
     assert origin.path == str(cfg_path)
     assert origin.description == "section 'testing' option 'valid'"
+
+
+def test_galaxy_retry_http_error_codes(tmp_path: pathlib.Path) -> None:
+    cfg_path = tmp_path / 'test.cfg'
+    cfg_path.write_text("[galaxy]\nretry_http_error_codes=429,502,520")
+    manager = ConfigManager(str(cfg_path))
+    result = manager.get_config_value("GALAXY_RETRY_HTTP_ERROR_CODES")
+    assert result == [429, 502, 520]
+
+
+def test_galaxy_retry_http_error_codes_invalid(tmp_path: pathlib.Path) -> None:
+    cfg_path = tmp_path / 'test.cfg'
+    cfg_path.write_text("[galaxy]\nretry_http_error_codes=429,502,520,invalid")
+    manager = ConfigManager(str(cfg_path))
+    with pytest.raises(AnsibleOptionsError) as exec_info:
+        manager.get_config_value("GALAXY_RETRY_HTTP_ERROR_CODES")
+    assert "Invalid value [429, 502, 520, 'invalid'] for config" in str(exec_info.value)