A


 * Abe, Masaki 


 * Abenante, Yolanda Petrone de


 * Acosta Salmerón, Francisco Javier


 * Adams, Mark


 * Adlerz, Gottfrid Agaton (1858-1918)
 * Agassiz, Jean Louis Rodolphe (1807-1873)
 * Agosti, Donat


 * Aguayo y Castro, Carlos Guillermo (1899-1982)
 * Akino, Toshiharu
 * Aktaç, Nihat


 * Alayo, Don Dalmau Pastor (1915-2001)


 * Albuquerque, Nicholas Lavor de


 * Aldawood, Abdulrahman S.


 * Alicata, Antonio


 * Alloway, Thomas M.


 * Allred, Dorald Mervin (1923-1996)


 * Almeida Filho, Antonio Jose de


 * Alpert, Gary Duane


 * 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


 * Arias-Penna, Tania Milena


 * 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


 * Azorsa, Frank


 * Azuma, Masao