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.

The King's African Rifles (KAR) was a British Colonial Auxiliary Forces regiment raised from Britain's East African colonies in 1902. It primarily carried out internal security duties within these colonies along with military service elsewhere during the world wars and other conflicts, such as the Malayan Emergency and the Mau Mau uprising. The regiment's enlisted soldiers were drawn from the native Africans, while most officers were seconded from the British Army. During the 1960s, as part of the decolonisation of Africa, more African officers were commissioned into the regiment before it was gradually disbanded. KAR battalions would go on to form the core of newly established armed forces throughout East Africa.