- Aplaca, Jed L
- Aplet, Gregory H
- Apley, Martyn L
- Aplin, D
- Aplin, K. P. (Kenneth Peter), 1958-
- Aplin, Ken
- Aplin, O V
- Aplin, O. V. (Oliver Vernon), 1858-1940
- Apodaca, C K
- Apodaca, María José
- Apolinar, Alejandro
- Apolinário, Júlio César Gama
- Apolinar-Maria, Brother,
- Apollinaire-Marie, Brother
- Apollonio, Marco
- Apollonius, of Perga.
- Apollonov, M K
- Apon, J. F.
- Apone, Fernando
- Aponte Diaz, M
- Aponte, Ameris,
- Aponte, Guillermo León
- Aponte, Juan José
- Aponte, N E
- Aponte, Orlando
- Aportela-Cortés Daniel
- Apostolidés, M N
- Apóstolo, Nancy Mariel
- Apostolopoulou, Evangelia
- Apostolov, Apostol
- App, Bernard Auman, 1906-
- App, Frank, 1886-
- Appadoo, Chandani
- Appalachian Evergreen Company,
- Appalachian Forest Experiment Station (Asheville, N.C.)
- Appalachian Fruit Research Station (Kearneysville, W. Va.)
- Appalachian Mountain Club.
- Appalachian Nurseries,
- Appalachian Nursery.
- Appalasamy, Suganthi
- Apparao, M R
- Appayya, M K
- Appel, A G
- Appel, Oliver.
- Appel, Otto, 1867-1952
- Appelhans, A D
- Appelhans, Marc
- Appelius, F. L. (Federigo Luigi), 1835-1876
- Appell, Paul, 1855-1930
- Appellöf, Jakob Johan Adolf, 1857-
- Appels, J
- Appert, Nicolas, 1749-1841
- Appezzato-da-Glória, Beatriz
- Appiah‑madson, Hannah J.
- Appino, Jon D
- Apple Grove Nurseries.
- Apple, Jennifer L
- Apple, Larry,
- Apple, Russell A
- Applebaum, S W
- Appleby, Bridget M.
- Appleby, James E.
- Appleby, M C
- Appleby, R M
- Appleby, Thomas.
- Applegate, Deborah R.
- Applegate, Elmer Ivan, 1867-1949
- Applegate, Richard L.
- Applegate, Roger D.
- Applegate, Shelton P.
- Appleman, Charles O
- Applequist, Wendy
- Appleton, Belinda.
- Appleton, Christopher C
- Appleton, Francis H.
- Appleton, Francis Henry.
- Appleton, Harold C.,
- Appleton, Lewis.
- Appleton, William S.
- Appleyard, VCL.
- Applied Aquatic Studies Workshop.
- Applied Aquatic Studies Workshop. Edmonton, Alberta) 1989-
- Applin, Esther R.
- Applin, J S
- Appolinário, Vivette
- Appoloni, A. M.
- Appoloni, Carlos Roberto
- Apps, Clayton D.
- Apps, G. J.
- Apps, P. J.
- Appukuttan, K K
- Appun, Carl Ferdinand, 1820-1872
- Appy, Ralph Grant, 1949-
- Aprea, Gennaro
- Apreval, A.R. D' fl 1880-1920
- Aprile, Fabio M. (Fabio Marques)
- Apriyanto, Dwinardi
- Apstein, C. (Carl Heinrich), 1862-1950
- Apstein, Carl
- Apt, Kirk
- Apte, Deepak
- Apte, Sharad
- Apthorpe, M
- Aptroot, André
- Aptroot, André
- Apuleius Barbarus.
- Apún-Molina, Juan Pablo
- Aqdus, Fauzia
- Aqmal-Naser, Mohamad
- Aquaculture Association Of South Africa.
- Aquadro, Charles F.
- Aquarium Stock Company.
- Aquatic Environments Limited.
- Aquatic Plant Nursery.
- Aquatic Sciences, Inc.
- Aqueveque, P M
- Aquidneck agricultural society.
- Aqüila, Maria Estefânia Alves
- Aquilar Enríquez, Maria de Lourdes
- Aquiles Darrieu, Carlos
- Aquinas, Sister M
- Aquino, Adriana E. (Adriana Elbia)
- Aquino, Aida Luz
- Aquino, Ana L.
- Aquino, Camila Akemy Nabeshima
- Aquino, Clarissa de
- Aquino, Daniel A.
- Aquino, David
- Aquino, Fabiana de Gois
- Aquino, Fabiana G.
- Aquino, Herla Ferreira de
- Aquino, Josenilda Saraiva de
- Aquino, Kyara Formiga de
- Aquino, Nathaly Costa de.
- Aquino, Paulo Antonio Neves de
- Aquino, Pedro De Podestà Uchôa de
- Aquino, Ricardo Braga
- Aquino-Bolaños Elia Nora
- Aquino-Cruz, Otto
- Aquino-Ortega, Ronald
- Aquino-Romero, Miriam
- Aquino-Silva, M. R.
- Ar, Amos
- Ara, Jamal
- Ara, Jehan
- Ara, Koichi
- Arabaci, Turan
- Arabian Horse Club of America.
- Arabian Horse Club Registry of America.
- Arabuli, Tea
- Aracena P., Olga L.
- Aracena, Claudia
- Arachnologische Arbeitsgemeinschaften Deutschlands.
- Arachnologische Gesellschaft.
- Aradas, Andrea, 1810-1882
- Aradis, Arianna
- Aragaki, Sonia
- Aragão Cardoso, Erick
- Aragão, Carlos Alberto
- Aragão, Carlos G.
- Aragão, Débora Veiga de
- Aragão, Henrique de Beaurepaire Rohan, 1879-1956
- Aragão, Luiz Eduardo Oliveira e Cruz de
- Aragão, T. P.
- Aragão-Tavares, Nísia Karine C.
- Aragno, M
- Arago, F. (François), 1786-1853
- Arago, Jacques, 1790-1855
- Aragón, Agustín.
- Aragon, Cristina F
- Aragón, Elizabeth E.
- Aragón, Eugenio.
- Aragon, Glauca Torres.
- Aragón, Gregorio
- Aragón, Laura
- Aragón, Santiago
- Aragón, Susan
- Aragona, Mônica
- Aragonés, Juan
- Aragoneses Lorite, Irene
- Aragón-Martínez Andrés
- Aragón-Martínez, María del Consuelo
- Aragón-Noriega, Eugenio Alberto
- Araguillin, Edison
- Arahoni, J
- Arai, Hisao P., 1926-
- Arai, Katsutoshi
- Arai, Mary Needler, 1932-2017
- Arai, Mitsuru
- Arai, S.
- Arai, Takako
- Arai, Takanobu
- Arai, Takaomi
- Arai, Yasumasa
- Arakaki, Mónica
- Arakaki, Natalia
- Arakaki, Seiji
- Arakawa, Emi
- Arakawa, Henrique Breda
- Arakawa, Ken Y.
- Arakelyan, Marine
- Araki, Hajime
- Araki, Hideo
- Araki, Makoto
- Arala-Chaves, Mario
- Aralbaev, N K
- Araldi, Cristhyane Garcia
- Aramayo, Silvia A
- Aramayo, Víctor
- Arambarri, Ana M.
- Arambarri, Angélica
- Arambarri, Angélica M. (Angelica Margarita), 1945-
- Arambourg, C. (Camille), 1885-1969
- Aramburu, María José
- Aramburú, Rosana M.
- Arámburu-Adame, C
- Arana, Diego Barros
- Arana, Francisca E., 1911-
- Arana, Irma
- Arana, Marcelo D. (Marcelo Daniel)
- Arana, Margarita
- Arana, Patricio M
- Arana-May, Abigail
- Aranceta-Garza, Fernando
- Arancibia, Melitón
- Arancibia, Paulina A
- Arancio, Gina.
- Aranda, Arion T.
- Aranda, B. R. C.
- Aranda, Carlos
- Aranda, Emilio M
- Aranda, Jorge E
- Aranda, Marcelo
- Aranda, Rodrigo
- Aranda, Susana G.
- Aranda-Coello, J. Manuel
- Aranda-Gomez, Jose Jorge
- Aranda-Rickert, Adriana
- Aranda-Ruiz, Juana
- Araneda Castillo, Alberto
- Araneda Durán, Ximena
- Araneda, Cristian
- Araneda, Loreto
- Aránega Jiménez, Inés Raquel
- Arangelov, Simeon
- Arango Y Molina, Rafael, 1893-
- Arango y Parreño, Francisco, 1765-1837
- Arango, Angélica M.
- Arango, B. Gabriela
- Arango, Claudia P