- Aizen, Marcelo A.
- Aizpuru Oiarbide, Iñaki
- Ajakaiye, J.J.
- Ajani, Penelope
- Ajani, Yousef
- Ajasson De Grandsagne, 1802-1845
- Ajayakumar, B
- Ajayakumara, K. M.
- Ajayi, S S
- Ajduk, H
- Aji, Cipto
- Ajiki, Kyoko
- Ajit, V. P.
- Ajith Kumar, C. R.
- Ajlan, Abdul-Aziz
- Aju, Javier
- Ak, Kibar
- 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
- Akaibe, Benjamin Dudu
- Akaki, C
- Akala, Angel C
- Akam, Michael
- Akama, Alberto
- Akama, Pierre
- Akamine, Ernest K
- Akan, Hasan
- Akanan, Watana
- Akar, Hamdi
- Akarsha, B M
- Akata, Ilgaz
- Akatsu, Ivan P.
- Akatsuki, Kane'nari, 1793 or 1794-1861
- Akbar, Khalid Farooq
- 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)
- Akeley, Carl Ethan, 1864-1926
- Akeley, Delia J. (Delia Julia), 1875-1970
- Aken, R. van
- Aken'Ova, Thelma
- Akerman, Alfred.
- Akerman, John Yonge, 1806-1873
- Akerman, K
- Akerman, Kim
- Akers, Charles Edmond, 1861-1915
- Akers, Daryl
- Akers, R C
- Akers, W.H.
- Akersten, William A.
- Akesson, Bertil
- Akesson, Norman B. (Norman Berndt), 1914-
- Akesson, S
- Aketarawong, Nidchaya
- Akey, David Harold
- Akgül, Hatice Esra
- Akhani, Hossein
- Akhmetova, Lilia
- Akhtar, M Saeed
- Akhtar, Nafisa
- Akhtar, Naim
- Akhtar, S. A.
- Akhter, Atiq
- Akhurst, John
- Akimetz, V S
- Akimichi, Tomoya.
- Akimoto, Shin–ichi
- Akin, Gwynn Collins
- Akin, John Rouse
- Akin, R. M.
- Akinlua, Isaiah Opeyemi
- Akinsanmi, Jamiu Taiwo
- Akintola, Shehu L
- Akinyemi, Oluwatosin
- Akiti, Jacques
- Akiyama, Hiroyuki
- Akiyama, T
- Akizuki, Korehide.
- Akkari, Nesrine
- Akkizov, Azamat
- Akkuş, Mustafa
- Akli-Bidi, Safia
- Akmali, Vahid
- Akmentins, Mauricio S
- Akmentins, Mauricio Sebastián
- Akoijam, Romila
- Akov, Shoshana
- Akpagana, K
- Akpan, Etie Ben.
- Akpo, L.-E.
- Akpokodje, E G
- Akram, Ayesha
- Akram, M
- Akrami, Mohammad Ali
- Akre, Roger D., 1937-
- Akrel, Fredrik, 1748-1804
- Akrell, Carl Fredrik, 1779-1868
- Akselman, Rut
- Aksenov, Vadim
- Aksenova, Olga
- Aksit, Deniz
- Aksornneam, Akrachai
- Aksoy, Ahmet
- Aksoy, Necmi
- Aksu, Ismail
- Aksu, Ismail
- Aksu, Ismail
- Aksu, Ismail
- Aksu, Sadi
- Akta, Sinan
- Aktac, Nihat
- Akthar, A
- Aktiebolaget Akademiska Bokhandeln
- Akuetteh, B.
- Akulov, Evgeniy
- Akulov, Olexander Yu.
- Akulova-Barlow, Zoya
- 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
- Al-Adawi, Ali O
- Alagar Rajan, S.
- Alagarda, Aurea
- Alagona Arthelouche, d'seigneur de Mararvecques.
- Alagona, Peter S
- Al-Aidaroos, Ali M.
- Alalykina, Inna
- Alam, Afroz
- Alam, Aftab
- Alam, M M
- Alam, Marilene Farias
- Alam, Md Mahabub
- Alam, Md. Khorshed
- Alam, Md. Shamshad
- Alam, Mohammad Shafiqui
- Alam, Mohd.
- Alam, Muhammad Maqsood
- Alam, Noore
- Alam, S.
- Alameda Creek Nursery.
- Alaminos, Javier
- Alamiri, Zaid
- Alamo, Eduardo Carqué
- Alamsyah, Firman
- Alamy Filho, José Eduardo.
- Alanís Flores, Glafiro J.
- Alanís-Rodríguez, Eduardo
- Alaniz, Alberto J
- Alaniz-Garfia, Gabriel
- Alanne, Elizabeth K.
- Al-Antary, Tawfiq M
- Alanwold Nursery.
- Alarcón C, Paula
- Alarcón Cabañero, Juan José
- Alarcón, Alejandro
- Alarcón, Carolina
- Alarcón, Consuelo
- Alarcón, Diego
- Alarcón, Emilio
- Alarcón, Gadiel
- Alarcón, Iván
- Alarcón, Manuel
- Alarcón, Mauricio E.
- Alarcón, Wilfredo
- Alarcón-Zúñiga, Baldomero
- Alard, Pascale
- Alaria, Alejandrina
- Alarie, Yves, 1956-
- Alaska Agricultural Experiment Station.
- Alaska Forest Research Center (U.S.)
- Alaska Interagency Coordination Center.
- Alaska Quaternary Center.
- Alaska Science Conference Washington, D.C.) 1950-
- Alaska. Department of Environmental Conservation.
- Alaska. Department of Fish and Game.
- Alaska. Division of Forestry.
- Alaska. Division of Geological and Geophysical Surveys.
- Alaska. Territorial Fish Commission.
- Alaskan Boundary Tribunal
- Alaskan Mammoth Expedition (1907-1908)
- Alatawi, Fahad Jaber
- Alatič, Andreja
- Alatorre-Jácome, Oscar
- al-'Aṭṭār, Muḥammad ibn Muḥammad ibn 'Alī,
- Alauzet, Claude
- Alava, Juan José
- Alava, Reino Olavi
- Alavi, Jalil
- Alay, F.
- al-'Aynzarbī, Abū al-Naṣr 'Adnān ibn Naṣr. 1153
- Alayo, Marianella
- Alayón García, Giraldo
- Alayón, Pedro José Pascual
- Alayse, A. M.
- Al-Azawi, Abdulla
- Alba, Christina
- Alba, E.
- Alba, Joel
- Alba-Avila, Jorge Arturo
- Albacete González, Sergio
- Albach, D C
- Albach, Dirk C
- Alba-Jiménez Jimena Esther
- Albaladejo, J
- Albalat-Botana, Amparo
- Albamont Gardens.
- Albán, Joaquina