Name
- A Gentil, printers, Paris, Early 20th century1
- Abdur Rahman Khan, Amir of Afghanistan, 1880-19011
- Admiralty War Staff, Naval Intelligence Division, 1912-19643
- Admiralty, 1708-19644
- Admiralty, Hydrographic Department, 1795-1
- Agent to the Governor-General, Resident and Chief Commissioner, Baluchistan, 1876-19471
- Agnew, John Vans, Army officer, 1859-19431
- Air Ministry, 1918-19644
- Ambassador of France to the United Kingdom, Early 18th century-1
- Ambassador of the Russian Empire to the United Kingdom, 1706-19171
- Baghdad Railway, 1903-3
- Baillie, Charles Wallace Alexander Napier Ross, 2nd Baron Lamington, politician and colonial administrator, 1860-19402
- Bakhtiyārī, Tribe, 14th century-1
- Balfour, Arthur James, 1st Earl of Balfour, Prime Minister and philosopher, 1848-19301
- Bishop, Isabella Lucy, explorer and writer, 1831-19041
- Board of Education, 1899-19442
- Board of Trade, 1786-19704
- Boital, Fabius, engineer, fl 1886-19001
- Bourne and Shepherd, photographers2
- Bourne, Samuel, photographer, 1834-19123