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- Aiken, George D.
- Aiken, J.
- Aiken, Marie
- Aiken, R B
- Aiken, Ron B
- Aiken, S. G.
- Aiken, Susan G
- Aiken, William E.A. (William Edward Augustin), 1807-1888
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- Aikman, George,
- Ail-Catzim, CE
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- Ainslie, R C
- Ainslie, Whitelaw, Sir 1767-1837
- Ainsworth Brothers & Co.
- Ainsworth Nebraska Nurseries.
- Ainsworth, Antony
- Ainsworth, Cheron
- Ainsworth, David
- Ainsworth, Ralph Mitchell, 1885-
- Ainsworth, Tracy D
- Ainsworth, William Thomas, 1858-
- Ainsworth-Boone Company.
- Ainsworth-Davis, J. R. (James Richard), 1861-1934
- Air Force Cambridge Research Laboratories (U.S.). Geophysics Research Directorate,
- Air Line Farm,
- Aira, Manuel
- Airaghi, C
- Airaghi, Carlo
- Airamé, Satie
- Aird, P. L.
- Airedale terrier club of New England.
- Aires, Carlos Cesar de Cima
- Aires, Caroline Cotrim
- Aires, Stefano Salvo
- Airola, D A
- Airoldi, J. P.
- Airriess, C N
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- Airy, George Biddell, Sir, 1801-1892
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- Aisenberg, Anita
- Aissa, Patricia
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- Aisyah, Munirah
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- Aitchison, G D
- Aitchison, James Edward Tierney 1835-1898
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- Aitchison, P. E.
- Aitchison, Tony John
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- Aitken, Carol
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- Aitken, Robert J.
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- Aitken, W W
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- Aitken, William, of Castle Douglas, Scotland.
- Aitken, Yvonne, 1911-2004
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- Aiton, William, 1731-1793
- Aiton, William, 1760-1848
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- Aiyadurai, Ambika
- Aizawa, Mineaki
- Aizawa, Takeshi
- Aizawa, Tomonushi, 1768-1849
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- Aizpuru Oiarbide, Iñaki
- Ajakaiye, J.J.
- Ajani, Penelope
- Ajani, Yousef
- Ajasson De Grandsagne, 1802-1845
- Ajayakumar, B
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- Ajiki, Kyoko
- Ajit, V. P.
- Ajith Kumar, C. R.
- Ajlan, Abdul-Aziz
- Aju, Javier
- Akabane, Shoji
- Akademie der Wissenschaften in Göttingen
- Akademie der Wissenschaften in Wien.
- Akademie der Wissenschaften in Wien. Mathematisch-Naturwissenschaftliche Klasse.
- Akademie der Wissenschaften in Wien. Historisch-Philologische Klasse.
- Akademie ved Ceské republiky
- Akademii͡a nauk SSSR.
- 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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- Akanan, Watana
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- Akatsuki, Kane'nari, 1793 or 1794-1861
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- Akbar, Shahid Ali
- Akbari, Mohammad
- Akbarian, Mohammad Reza
- 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)
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- Akeley, Delia J. (Delia Julia), 1875-1970
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- Aken'Ova, Thelma
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- Akers, R C
- Akers, W.H.
- Akersten, William A.
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- Akesson, S
- Aketarawong, Nidchaya
- Akey, David Harold
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- Akhmetova, Lilia
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- Akhtar, Nafisa
- Akhtar, Naim
- Akhtar, S. A.
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- Akhurst, John
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- Akimoto, Shin–ichi
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- Akin, John Rouse
- Akin, R. M.
- Akinlua, Isaiah Opeyemi
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- Akintola, Shehu L
- Akinyemi, Oluwatosin
- Akiti, Jacques
- Akiyama, Hiroyuki
- Akiyama, T
- Akizuki, Korehide.
- Akkari, Nesrine
- Akkizov, Azamat
- Akkuş, Mustafa
- Akmali, Vahid
- Akmentins, Mauricio Sebastián
- Akoijam, Romila
- Akov, Shoshana
- Akpagana, K
- Akpan, Etie Ben.
- Akpo, L.-E.
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- Akram, M
- Akrami, Mohammad Ali
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- Akrel, Fredrik, 1748-1804
- Akrell, Carl Fredrik, 1779-1868
- Akselman, Rut
- Aksenova, Olga
- Aksit, Deniz
- Aksornneam, Akrachai
- Aksoy, Ahmet
- Aksoy, Necmi
- Aksu, Ismail
- Aktac, Nihat
- Akthar, A
- Aktiebolaget Akademiska Bokhandeln
- Akuetteh, B.
- Akulov, Evgeniy
- Akyurek, Basak
- Al Ansi, Amin
- Al Balawi, Manal S.
- Al Dhafer, Hathal
- Al Gazi, Ariel David Freitas
- Al Hemaidi, Ahmad Amer
- Al Jaidah, Noora
- Al Khatib, Fadel
- Al Kolibi, Fahad M.
- Al Mutairi, Mohammed
- Al Noor, Sajed
- Ala, Schweizerische Gesellschaft für Vogelkunde und Vogelschutz.
- Alabama Academy of Science.
- Alabama Agricultural Experiment Station.
- Alabama Gulf Coast Nurseries.
- Alabama Museum of Natural History.
- Alabama Nursery Co.
- Alabama Nursery Company (East Saint Louis, Ill.)
- Alabama Nursery Company.
- Alabama Pecan Growers' Association. Annual Convention.
- Alabama.
- Alabama. Dept. of Agriculture and Industries.
- Alabama. Dept. of Agriculture.
- Alabama. Dept. of education.
- Alabama. Dept. of Game and Fish.
- Alabama. Live Stock Sanitary Board.
- Alabouvette, C
- Alagar Rajan, S.
- Alagarda, Aurea
- Alagona Arthelouche, d'seigneur de Mararvecques.