The most famous Biologists around the words are listed below:
# Humayun Abdulali (1914-2001), Indian ornithologist
# Aziz Ab'Saber (1924-), Brazilian geographer, geologist and ecologist
# Erik Acharius (1757-1819), Swedish botanist
# Johann Friedrich Adam (18th cent - 1806), Russian botanist
# Arthur Adams (1820-1878), English physician and naturalist
# Henry Adams (1813-1877), English naturalist and conchologist
# Michel Adanson (1727-1806), French naturalist (abbr. in botany : Adans.)
# Edgar Douglas Adrian (1889-1977), British electrophysiologist, winner of the 1932 Nobel Prize in Physiology or Medicine for his research on neurons
# Adam Afzelius (1750-1837), Swedish botanist
# Carl Adolph Agardh (1785-1859), Swedish botanist
# Jacob Georg Agardh (1813-1901), Swedish botanist
# Louis Agassiz (1807-1873), Swiss zoologist
# Alexander Agassiz (1835-1910), American zoologist, son of Louis Agassiz
# Nikolaus Ager (1568-1634), French botanist
# William Aiton (1731-1793), Scottish botanist (abbr. in botany : Aiton)
# Pedro Alberch i Vié (1954-1998), Spanish naturalist
# Bruce Alberts (born 1938), American biochemist, former President of the National Academy of Sciences
# Boyd Alexander (1873-1910), English ornithologist
# Horace Alexander (1889-1989), English ornithologist
# Richard D. Alexander (born 1930), American evolutionary biologist
# Wilfred Backhouse Alexander (1885-1965), English ornithologist
# Alfred William Alcock (1859-1933), British naturalist
# Salim Ali (1896-1987), Indian ornithologist
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