The West African Frontier Force (WAFF) was a multi-battalion field force, formed by the British Colonial Office in 1900 to garrison the West African colonies of Nigeria, Gold Coast, Sierra Leone and Gambia. In 1928, it received royal recognition, becoming the Royal West African Frontier Force (RWAFF).

British West Africa was the collective name for British settlements in West Africa during the colonial period, either in the general geographical sense or the formal colonial administrative entity. British West Africa as a colonial entity was originally officially known as Colony of Sierra Leone and its Dependencies, then British West African Territories and finally British West African Settlements.