Authors: r
- Ashby, Richard -
- Ashworth, T. R. (Thomas Ramsden) 1864-1935
- Aspelin, J. R. (Johan Reinhold) 1842-1915
- Astarita, Rafael Jerard Norman 1912-1994
- Atkinson, Robert 1863-1896
- Atkinson, William Walker 1862-1932
- Atteridge, A. Hilliard (Andrew Hilliard) -1941
- Audibert, P. Raymond (Paul Raymond) 1858-1919
- Audubon, John James 1785-1851
- Audubon, Maria R. (Maria Rebecca) 1843-1925
- Auguis, P. R. (Pierre René) 1786-1846
- Augustus, Emperor of Rome -63-14
- Austen-Leigh, Richard Arthur 1872-1961
- Austin, Robert 1895-1973
- Auzias-Turenne, Raymond 1861-1940
- Averroës 1126-1198
- Aveson, Robert 1847-1939
- Aycock, Roger D. 1914-2004
- Ayers, Dick 1924-2014
- Ayres, Lucie Levéque -
- Ayres, Ruby M. (Ruby Mildred) 1883-1955
- Azorín 1873-1967
- Babcock, Retta B. -
- Babson, Roger Ward 1875-1967
- Backscheider, Paula R. 1943-
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