The Colony of Aden was a British Crown colony from 1937 to 1963 located in the south of contemporary Yemen. It consisted of the port of Aden and its immediate surroundings.
Prior to 1937, Aden had been governed as part of British India (originally as the Aden Settlement subordinate to the Bombay Presidency, and then as a Chief Commissioner’s province). Under the Government of India Act 1935 the territory was detached from British India and established as a separate colony of the United Kingdom; this separation took effect on 1 April 1937.
On 18 January 1963, the colony was reconstituted as the State of Aden within the new Federation of South Arabia. The federation in turn became the People’s Democratic Republic of Yemen on 30 November 1967, marking the end of British rule.
The hinterland of the Colony of Aden was separately governed as the Aden Protectorate.