Authors: G
- Adlam, George Henry Joseph 1876-1946
- Adlercreutz, Gustav Magnus 1775-1845
- Adler, G. J. (George J.) 1821-1868
- Adlersfeld-Ballestrem, Eufemia von 1854-1941
- Aflalo, Frederick G. (Frederick George) 1870-1918
- Africanus, Sextus Julius -
- Agee, George W. (George Washington) 1846-1909
- Agricola, Georg 1494-1555
- Aguilar, Grace 1816-1847
- Ahad Ha'am 1856-1927
- Aiazzi, Giuseppe -1869
- Aiken, George L. 1830-1876
- Aikin, Lucy 1781-1864
- Aimard, Gustave 1818-1883
- Aimel, Georges -
- Ainslie, Graham Montgomery 1883-1949
- Airy, George Biddell 1801-1892
- Aitchison, George 1825-1910
- Aitken, George Atherton 1860-1917
- Alabama Museum of Natural History -
- Alas, Leopoldo 1852-1901
- Albert, Prince Consort, consort of Victoria, Queen of Great Britain 1819-1861
- Albertus, Magnus, Saint -1280
- Aldini, Giovanni 1762-1834
- Alexander, Georgia 1868-1928
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