Abercrombie, John (1726–1806)
Adanson, Michel (1727–1806)
Addison, Thomas (1793–1860)
Adler, Alfred (1870–1937)
Adrian, Edgar Douglas (1889–1977)
Agre, Peter (1949– )
Akeley, Carl (Ethan) (1864–1926)
Aldrovandi, Ulisse (1522–1605)
Allard, Harry A(rdell) (1880–1963)
Allison, James Patrick (1948– )