Name
- Abdul, Sheikh, military surveyor, fl 19011
- Adam and Charles Black, of London; printers, 1807-1
- Adams, Hamilton John, Knight, army officer and colonial official, 1858-19204
- Adams, Henry Edward Fane, Knight, army officer, 1860-19351
- Adlam, -, surveyor, fl 19001
- Admiralty Office1
- Admiralty War Staff, Naval Intelligence Division, 1912-19643
- Admiralty, 1708-19642
- Admiralty, Hydrographic Department, 1795-1
- Agar, Edward, army officer, 1859-19306
- Ainsworth, John Dawson, colonial administrator, 1864-19461
- Air Council, 1918-19641
- Air Ministry, 1918-19641
- Air Survey Company of India, Early 20th century - Mid 20th century1
- Aitchison, Charles Umpherston, Knight, administrator in India, 1832-18967
- Albert, J.1
- Alderson, Henry James, Knight, army officer, 1834-19091
- Allan, A, fl 18181
- Allan, Alexander, 1st Baronet, politician, c 1764-18201
- Allen and Co William H., London, England1