Editing List of biologists (section)

=== Al–An ===
*[[Nagima Aitkhozhina]] (1946–2020), Kazakh molecular biologist,  structural and functional organisation of the genome of higher organisms and the molecular mechanisms of regulation of its expression.
*[[William Aiton]] (1731–1793), Scottish botanist,<ref>Abbreviation in botany: Aiton</ref> director of the botanical garden at Kew
*[[Bruce Alberts]] (born 1938), American biochemist, former President of the United States National Academy of Sciences, known for studying the protein complexes involved in chromosome replication, and for the book  ''Molecular Biology of the Cell'' 
*[[Robert Alberty]] (1921–2014), American physical biochemist, with many contributions to enzyme kinetics.
*[[Alfred William Alcock]] (1859–1933), British systematist of numerous species, aspects of biology and physiology of fishes
*[[Nora Lilian Alcock]] (1874–1972), British pioneer in plant pathology<ref>Abbreviation in botany: N.L.Alcock</ref> who did research on fungal diseases
*[[Boyd Alexander]] (1873–1910), English ornithologist who made surveys of birds in the Gold Coast (now Ghana), and the Bonin Islands
*[[Richard D. Alexander]] (1929–2018), American evolutionary biologist whose scientific pursuits integrated systematics, ecology, evolution, natural history and behaviour
*[[Salim Ali (ornithologist)|Salim Ali]] (1896–1987), Indian ornithologist who conducted systematic bird surveys across India
*[[Frédéric-Louis Allamand]] (1736–1809), Swiss botanist<ref>Abbreviation in botany: F.Allam.</ref> who described several plant genera
*[[W. C. Allee|Warder Clyde Allee]] (1885–1955), American zoologist and ecologist, identified the Allee effect (correlation between population density and individual fitness)
*[[Joel Asaph Allen]] (1838–1921), American zoologist<ref>Abbreviations in zoology: Allen, J.A. Allen</ref> who studied birds and mammals, known for ''Allen's rule''
*[[Jorge Allende]] (born 1934), Chilean biochemist known for contributions to the understanding of protein biosynthesis
*[[George James Allman]] (1812–1898), British naturalist who did important work on the gymnoblasts
*[[June Dalziel Almeida]] (1930–2007), Scottish virologist who pioneered techniques for characterizing viruses, and discovered Coronavirus
*[[Tikvah Alper]] (1909–1995), South African radiobiologist who showed that the infectious agent of scrapie contains no nucleic acid
*[[Prospero Alpini]] (1553–1617), Italian botanist,<ref>Abbreviation in botany: Alpino</ref> the first in Europe to describe coffee and banana plants 
*[[Sidney Altman]] (1939–2022), Canadian-born molecular biologist, winner of the 1989 Nobel Prize in Chemistry for his work on RNA