A
- Abe, Masaki
- Abenante, Yolanda Petrone de
- Acosta Salmerón, Francisco Javier
- Adams, Mark
- Adams, Rachelle M.M.
- Adlerz, Gottfrid Agaton (1858-1918)
- Agassiz, Jean Louis Rodolphe (1807-1873)
- Agosti, Donat
- Aguayo y Castro, Carlos Guillermo (1899-1982)
- Ahmad, M. M. Galhoum
- Aibek, Ulykpan
- Ajerrar, Abdelhadi
- Akbar, Shahid Ali
- Akino, Toshiharu
- Aktaç, Nihat
- Alayo, Don Dalmau Pastor (1915-2001)
- Albuquerque, Nicholas Lavor de
- Aldawood, Abdulrahman S.
- Alicata, Antonio
- Alipanah, Helen
- Alloway, Thomas M.
- Allred, Dorald Mervin (1923-1996)
- Almeida Filho, Antonio Jose de
- Alpert, Gary Duane
- Amor, Fernando
- Andersen, Alan Neil
- Andersen, Nils Otto Moller (1940-2004)
- Anderson, Janet L.
- Andrásfalvy, András
- André, Ernest (1838-1914)
- André, Jacques Ernest Edmond (1844-1891)
- Andrews, Hazel Q.
- Antonialli Junior, William Fernando
- Arakelian, Gevork R.
- Archibald, S. Bruce
- Aria, Cedric
- Arias-Penna, Tania Milena
- Arimoto, Koichi
- Arnold, George (1881-1962)
- Arnol'di, Konstantin Vladimarovitsch (1901-1982)
- Ashmead, William Harris (1855-1908)
- Assmann, August (1819-1898)
- Astruc, Cyril
- Atanassov, Neno
- Atherton, David Ord
- Austin, Andrew D.
- Azorsa, Frank
- Azuma, Masao