- American Medical Association. Committee on Public Hygiene.1
- American Medical Association. Committee on Surgery, author.1
- Ames, S.1
- Amussat, J.-Z. (Jean Zuléma), 1796-18561
- Anderson, Charles, 1814-18951
- Anderson, Robert M. (Robert Meredith)1
- Andral, G. (Gabriel), 1797-18765
- Andry, Félix, 1808-18801
- Aran, F. A. (François Amilcar), 1817-18611
- Arnott, Neil, 1788-18743
- Arthur, Robert, 1819-18801
- Ashwell, Samuel, 1798-18572
- Atlee, Washington L. (Washington Lemuel), 1808-18784
- Augusta State Hospital (Augusta, Me.)1
- Auzoux, Louis Thomas Jérôme, 1797-18802
- Ayre, Joseph, 1781-18601
- Bache, A. D. (Alexander Dallas), 1806-1867, author1
- Bache, Franklin, 1792-18642
- Bagley, George K.1
- Bailey, J. W.1