The Aden Protectorate was a British protectorate in southern Arabia. The protectorate evolved in the hinterland of the port of Aden and in the Hadhramaut after the conquest of Aden by the Bombay Presidency of British India in January 1839, and which continued until the 1960s. In 1940, it was divided for administrative purposes into the Western Protectorate and the Eastern Protectorate. The territory now forms part of the Republic of Yemen.

South Arabia is a historical region that consists of the southern region of the Arabian Peninsula in Western Asia, mainly centered in what is now the Republic of Yemen, yet it has also historically included Najran, Jizan, Al-Bahah, and 'Asir, which are presently in Saudi Arabia, and the Dhofar of present-day Oman.