- Abt, Arthur F. (Arthur Frederick), 1898-1974 author1
- Abt, Henry Edward, 1904-1962 author1
- Académie de médecine (France)1
- Acland, Henry W. (Henry Wentworth), 1815-19001
- Adami, J. George (John George), 1862-19261
- Adams Nervine Asylum, author.1
- Adams, J. F. Alleyne (James Forster Alleyne), 1844-1914 author1
- Adams, John, 1735-1826, author1
- Adkins, Grace Reese, author1
- Agboola, Foluso, author1
- Agg, John, 1783-18551
- Ahl's Splint Manufacturing Co., author.1
- Aickin, Thomas, 1814-18971
- Ailhaud, Jean, 1674 or 1675-1756, author1
- Ainsworth, William Francis, 1807-18961
- Air University (U.S.). Arctic, Desert, and Tropic Information Center, author.1
- Aitken, William, 1825-1892, author1
- Alden, Charles Henry, 1836-1906, author1
- Alden, Ebenezer, 1788-18811
- Alderson, James, Sir, 1794-18821