- Allen, Nathan, 1813-1889, author2
- Allen, Paul W.1
- Alley, James T.1
- Alleyne, J. S. B. (Jeremiah Smith Bois), 1826-18951
- Allibone, S. Austin (Samuel Austin), 1816-1889 compiler4
- Allport, W. W. (Walter Webb), 1824-18931
- Almeida, Americo Vespucio Moreira de.1
- Alpedriz, Aristides Felinto de.1
- Althaus, Julius, 1833-19001
- American Association for the Relief of the Misery of Battle Fields.1
- American Institute of Homeopathy, author.1
- American Medical Association. Committee on Medical Education.1
- American Medical Association. Committee on the Relations of Alcohol to Medicine, author.1
- American Pharmaceutical Association. Committee on the Drug Market, author.1
- American Philosophical Society.1
- American Tract Society (Boston, Mass.)1
- Amesbury, Walter Raleigh.1
- Amory, Robert, 1842-1910, author3
- Amory, Thomas C. (Thomas Coffin), 1812-18891
- Anderson, James, 1798-18861