The Sudan Defence Force (SDF) was a British Colonial Auxiliary Forces unit raised in the Anglo-Egyptian Sudan in 1925 to assist local police in internal security duties and maintain the condominium's territorial integrity. During World War II, it also served in East Africa as part of the East African campaign and in North Africa during the Western Desert campaign.

The British Colonial Auxiliary Forces were the various military forces of Britain's colonial empire which were not considered part of the British military proper.