Name
- 39th Central India Horse, 20th century2
- Aden Boundary Commission, 1902?-19055
- Aden Boundary Commission, Commissioner, 1902-19055
- Admiralty Commission on the Persian Oilfields, 1913-19141
- Admiralty, 1708-196427
- Admiralty, Hydrographic Department, 1795-1
- Adviser to the Government of Bahrain, 1926-19577
- Aga Khan III, 1877-19572
- Agent to the Governor-General, Resident and Chief Commissioner, Baluchistan, 1876-19472
- Air Council, 1918-19642
- Air Ministry, 1918-19643
- Air Officer Commanding, Iraq, 1921-19551
- All India Muslim League, 1906-19472
- Ambassador of France to the United Kingdom, Early 18th century-6
- Ambassador of the Russian Empire to the United Kingdom, 1706-19173
- Amīn al-Sulṭān, Mīrzā ʻAlī Aṣghar Khān, Ṣadr-i Aʿẓam, politician, 1858-19071
- Andrae, Walter, archaeologist, 1875-19561
- Andrew Weir Group, 1885-1
- Anglo-Iranian Oil Company Limited, 1909-195432
- Anglo-Persian Military Commission, 19201