- Anthropological Society of Washington (Washington, D.C.), author.3
- Anti-Tenement House League.1
- Antisell, Thomas, 1817-18933
- Antisell, Thomas, 1817-1893, author2
- Antonelli, Richard C., author1
- Antonio, Nicolas, 1617-1684, author2
- Antonisse, Larisa, author17
- Antony, Milton, 1789-18391
- Antunes, Odorico Carlos Bacellar.1
- Apel, Luiz.1
- Apgar, Edgar K., author1
- Appleby, John, author1
- Applegarth, E. C., author1
- Appleton, Jesse, 1772-18191
- Appleton, John Howard, 1844-1930 author3
- Aqsarāʼī, Muḥammad ibn Muḥammad, active 14th century1
- Aquino Fonseca Dr. (Joaquim d')1
- Aragão, Egas Carlos Moniz Sodré de.3
- Arago, Jacques Etienne Victor, 1790-1855, artist1
- Aragón, José M., author1