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- Ahola, Matti
- Ahola, Milla
- Ahrendsen, Dakota
- Ahrens, August, 1779-1841
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- Ahumada-Rudolph, Ramón
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- Ahyong, Shane T.
- Ahyong, Shane T.
- Ahyong, Shane T.
- Ai, Congcong
- Ai, Cong-Cong
- Ai, Hong-Mu
- Ai, Min
- Ai, Renda
- Ai, Takano
- Aiba, Shin-ichiro
- Aibar, Pablo
- Aibek, Ulykpan
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- Aicha, Tadjine
- Aichele, F. J., Jr.
- Aichele, Fr
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- Aikawa, Minwa, active 1806-1821
- Aiken Nurseries.
- Aiken, Charles Edward Howard, 1850-1936
- Aiken, D E
- Aiken, D W
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- Aiken, J.
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- Aiken, Marie
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- Ainslie, Whitelaw, Sir 1767-1837
- Ainsworth Brothers & Co.
- Ainsworth Nebraska Nurseries.
- Ainsworth, Antony
- Ainsworth, Cheron
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- Ainsworth-Boone Company.
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- Air Force Cambridge Research Laboratories (U.S.). Geophysics Research Directorate,
- Air Line Farm,
- Aira, Manuel
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- Airamé, Satie
- Aird, P. L.
- Airedale terrier club of New England.
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- Aires, Caroline Cotrim
- Aires, Stefano Salvo
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- Airy, George Biddell, Sir, 1801-1892
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- Aiston, George
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- Aizawa, Mineaki
- Aizawa, Takeshi
- Aizawa, Tomonushi, 1768-1849
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- Aizpuru Oiarbide, Iñaki
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- Ajani, Yousef
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- Ajith Kumar, C. R.
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- Akabane, Shoji
- Akademie der Wissenschaften in Göttingen
- Akademie der Wissenschaften in Wien.
- Akademie der Wissenschaften in Wien. Mathematisch-Naturwissenschaftliche Klasse.
- Akademie ved Ceské republiky
- Akademii͡a nauk SSSR.
- Akademii︠a︡ Nauk Sssr. Komissii︠a︡ po izuchenii︠u︡ chetvertichnogo perioda.
- Akademii͡a nauk SSSR. Otdelenie fiziko-matematicheskikh nauk.
- Akademii͡a nauk SSSR. Otdelenie geologo-geograficheskikh nauk.
- Akademisch Museum te Groningen.
- Akademische Jubiläumsstifung (Berlin, Germany)
- Akademischer Naturwissenschaftliche Verein.
- Akademiska Boktryckeriet.
- Akademja Umiejętności w Krakowie.
- Akademja Umiejętności w Krakowie. Wydział Matematyczno-Przyrodniczy
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- Akama, Alberto
- Akama, Pierre
- Akamine, Ernest K
- Akan, Hasan
- Akanan, Watana
- Akar, Hamdi
- Akar, Muhammed Salih
- Akarsha, B M
- Akata, Ilgaz
- Akatsu, Ivan P.
- Akatsuki, Kane'nari, 1793 or 1794-1861
- Akbar, Khalid Farooq
- Akbar, Shahid Ali
- Akbari, Abolfazl
- Akbari, Mohammad
- Akbarian, Mohammad Reza
- Akçay, Mustafa Emre
- Aké Assi, Laurent, 1931-2014
- Aké-Castillo, José Antolín
- Akef, M S A
- Akehurst Nurseries,
- Akel, Matt
- Akeley Expedition to British East Africa (1909-1911)
- Akeley, Carl Ethan, 1864-1926
- Akeley, Delia J. (Delia Julia), 1875-1970
- Aken, R. van
- Aken'Ova, Thelma
- Aker, Jana M