- Armstrong, Wm. (William), Dr1
- Arnold, J. L. (John L.)4
- Arnold, Richard D. (Richard Dennis), 1808-18764
- Arthur, Robert, 1819-18803
- Asiatic Company.1
- Askew, Henry F. (Henry Ford), 1805-18761
- Association of Medical Superintendents of American Institutions for the Insane. Annual Meeting 1853 : Baltimore, Md.)1
- Atlee, Washington L. (Washington Lemuel), 1808-18784
- Atlee, Washington L. (Washington Lemuel), 1808-1878, author1
- Austen, Philip H. (Philip Hiss), 1822-18781
- Axson, A. F. (Anthony Forster), 1815-1881, author1
- Axson, A. Fontes1
- Ayre, Joseph, 1781-18603
- Ayres, Daniel, 1822-18921
- Bache, A. D. (Alexander Dallas), 1806-18671
- Bache, Franklin, 1792-18642
- Bachman, John, 1790-18742
- Backus, H. (Henry)1
- Bailey, Jacob Whitman, 1811-18572
- Bailliè€re, Hippolyte, author1