Name
- 12th Indian Division, 1915-19161
- A V Roe and Company, aircraft manufacturer, 1910-19631
- AHQ, Aden, Mid 20th century1
- AHQ, Burma, Mid 20th century1
- AHQ, India, Mid 20th century2
- AHQ, Iraq, 1941-19558
- Abbo, Naoum, fl 1915-19351
- Abraham, William Ernest Victor, army officer and oil company employee, 1897-19801
- Abu Dhabi Company for Onshore Oil Operations, 1936-8
- Academy of Persian Language and Literature, 1935-1
- Aden Armed Police Force, 19th century - 20th century1
- Aden Labour Association, 1932-19331
- Aden Political Agency, 1839-18541
- Aden Port Trust, 1888-3
- Aden Protectorate Levies, 1928-19671
- Aden Standing Committee, Early 20th century - Mid 20th century1
- Administrator General of the Finances of Iran, 1942-19453
- Admiralty Secretariat, Military Branch, 1832-19471
- Admiralty War Staff, Naval Intelligence Division, 1912-19642
- Admiralty, 1708-196464