- Ohl, Michael
- Ohlemüller, Ralf
- Ohlendorf, Harry M.
- Ohlendorf, Walter, 1891-
- Ohler, A
- Ohler, Annemarie
- Ohlert, Arnold
- Ohlin, Axel Gabriel, 1867-
- Ohlsen, D J
- Ohlsen, Daniel
- Ohlsen, Daniel J
- Ohlsson, Thomas
- Ohlsson-Salmon, Rosanna
- Ohlund, Sandy
- Ohlweiler, Fernanda
- Ohlweiler, Fernanda Pires
- Ohlweiler, Fernanda Pires
- Ohly, Jörg J.
- Ohm, Focht & Shellhamer.
- Ohm, Peter
- Ohman, J C
- Ohman, John H., 1931-
- Ohmann, Janet L.
- Ohmann, L. F.
- Ohmart, Robert D.
- Ohmert, Wolf
- Ohmi, Chika
- Ohmolt, Pe
- Ohmura, Yoshihito
- Ohn Set
- Ohnishi, Eiji
- Ohnishi, Ken
- Ohno, Kazuro
- Ohno, Suguru
- Ohno, T
- Ohno, Terufumi
- Ohno, Yujiro
- Ohono, Takashi
- Ohoto Omana Losokola, Emilienne
- Ohr, H D
- Ohrens, Omar
- Ohri, Deepak
- Ohshima, H
- Ohshima, Hiroshi
- Ohshima, Issei
- Ohslen, Daniel J.
- OhSoon-Ok
- Ohsuga, Ken
- Ohta, Kazuki
- Ohta, Naoshi
- Ohta, S
- Ohta, Suguru
- Ohta, Tadayuki
- Ohta, Yasuhiko
- Ohtaka, A
- Ohtaka, Akifumi
- Ohtake, Hideki
- Ohtake, Shin-Ichi
- Ohtaki Mr.
- Ohtaki, Harumi
- Ohtaki, Tetsuya
- Ohtani, Hiromi
- Ohtani, M
- Ohtani, Youko
- Ohtsu, Kohzoh
- Ohtsu, Kozo
- Ohtsuka, Eiji
- Ohtsuka, S
- Ohtsuka, Susumo
- Ohtsuka, Susumu
- Ohtsuka, Taisuke
- Ohtsuki, Kazuaki
- Ohtsuki, Tatsuo
- Ohuchida, Akinobu
- Ohwada, T
- Ohya, Yoshie
- Oi, Jisaburo, 1905-1977
- Oiano-Neto, João
- Oieni, S.
- Oigman-Pszczol, Simone Siag
- Oijen, M. J. P. van
- Oikonomidēs, Al. N.
- Oinuma, Tsutomu
- Oishi, César Augusto
- Oishi, Elizabeth
- Oishi, K K
- Oishi, Kugao
- Oishi, Masako
- Oishi, Tadashi
- Oitaven, Leonardo P C
- Oiticica Filho, José, 1906-1964
- Ojanguren Affilastro, Andrés A.
- Ojeda Benítez, Sara
- Ojeda Cabrera, Leslie Melisa
- Ojeda Caicedo, V. V.
- Ojeda Flores, Rafael
- Ojeda, A
- Ojeda, Agustina
- Ojeda, Agustina
- Ojeda, Agustina A
- Ojeda, Agustina A.
- Ojeda, E P
- Ojeda, F. Patricio
- Ojeda, Fabiana Soledad
- Ojeda, Fernando
- Ojeda, I
- Ojeda, Isidro
- Ojeda, Jaime
- Ojeda, Jaime
- Ojeda, Johana A
- Ojeda, M
- Ojeda, Mariel
- Ojeda, MS
- Ojeda, Nelson
- Ojeda, Ricardo A. (Ricardo Alberto)
- Ojeda, Tomás Thayer
- Ojeda, V
- Ojeda, Valeria
- Ojeda, Valeria S.
- Ojeda, Vicente
- Ojeda, Vilma
- Ojeda-Barrios, D
- Ojeda-Benítez Sara
- Ojeda-Camacho, M
- Ojeda-Morales Marcia Eugenia
- Ojeda-Zacarías, M.C.
- Ojeda-Zacarías, Ma del Carmen
- Ojeda-Zacarías, MC
- Ojha, Rijan
- Oji, Tatsuo
- Ojopi, Gil A.
- Ojoyi, M.M.
- Ojwang, William
- Ok, Durmus
- Oka, Asajirō, 1868-1944
- Oka, Hidemiti
- Oka, Masakazu
- Oka, Shin-Ichiro
- Oka, Y
- Oka, Yoshitaka
- Okabe, Norikazu
- Okada, Edson K.
- Okada, Edson Kioshi
- Okada, G
- Okada, Hiroshi
- Okada, K A
- Okada, Kanrin, 1780-1849
- Okada, MA.
- Okada, Manabu
- Okada, Ryohei
- Okada, Sachiko
- Okada, Shigefumi
- Okada, Sumio
- Okada, T
- Okada, Toyohi
- Okada, Y
- Okada, Yaichiro
- Okada, Yasukazu
- Okada, Yô K
- Okada, Yoshinori
- Okada, Yukio
- Okai, Daniel B.
- Okajima, Akira
- Okajima, S
- Okajima, Shoji
- Okajima, Shuji
- Okaley'S Glad Spot.
- Okamori, Claudia M.
- Okamoto, Hanjiro
- Okamoto, Janete Mayumi
- Okamoto, Jo
- Okamoto, Ken
- Okamoto, Ken-Ichi
- Okamoto, Kiyoshi
- Okamoto, Marcelo H
- Okamoto, Marcelo H.
- Okamoto, Mitsumasa
- Okamoto, Ryo
- Okamoto, Sumito
- Okamoto, Takashi
- Okamoto, Taku
- Okamura, B
- Okamura, Beth
- Okamura, K
- Okamura, Kintaro, 1867-1935
- Okamura, R T
- O'Kane, Mary
- Okane, S L
- O'Kane, Steve L
- O'Kane, Walter Collins, 1877-
- O'Kane, Walter Collins, 1877-
- Okanishi, Masanori
- Okanishi, Massanori
- Okano, T
- Okano, Yasuhisa
- Okanogan Nurseries.
- Okawa, Marco Hiroshi
- Okawara, Renan Yoshiharu
- Okayasu, Juriya
- Okazaki, Ernest
- Okazaki, Kayo
- Okazaki, Robert
- Oke, C
- Oke, C G
- Oke, Charles
- Oke, Charles G
- Oke, David O
- Oke, Ross
- Oke, Samson O.
- Okeden, W P
- O'Keefe, F. Robin
- O'Keefe, John
- O'keefe, John F
- O'Keefe, Marion
- OKeefe, Raven.
- O'Keefe, Sean T.
- O'Keefe, Thomas Stephen.
- Okeke, B. C.
- Okello, Moses M.
- Oken, Lorenz, 1779-1851
- O'kennon, Bob
- O'kennon, R J
- O'kennon, Robert J
- Okera, W
- Oketch, Ambata D.
- Oketch, Dancun A.
- Okethuwengu, Geoffrey
- Okey, Charles W. (Charles William), 1886-
- Okey, E N
- Okey, Thomas, 1852-1935
- Okeyoyin, Agboola
- Oki Nursery,
- Oki, Yumi
- Okia, O Nathan
- Okimoto, K Darren
- Okimoto, Ronald
- Okinaga, Shoichi
- O'Kinealy, James
- Okita, Yishihito
- Okkelberg, Peter Olaus.
- Oklahoma Academy of Science
- Oklahoma Biological Survey.
- Oklahoma City Nursery.
- Oklahoma Crop Improvement Association.
- Oklahoma Fishery Research Laboratory.
- Oklahoma Geological Survey.
- Oklahoma Improved Seed Co., Inc.
- Oklahoma Junior Academy of Science.
- Oklahoma Museum of Natural History (Norman, Okla.)
- Oklahoma State Livestock Registry Board.