- Ojeda, F. Patricio
- Ojeda, Fabiana Soledad
- 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, 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
- Oji, Tatsuo
- Ojoyi, M.M.
- Oka, Asajirō, 1868-1944
- Oka, Hidemiti
- Oka, Masakazu
- Oka, Y
- Oka, Yoshitaka
- Okabe, Norikazu
- Okada, Edson K.
- Okada, Edson Kioshi
- Okada, Hiroshi
- Okada, K A
- Okada, Kanrin, 1780-1849
- Okada, MA.
- Okada, Manabu
- Okada, Ryohei
- Okada, Shigefumi
- Okada, Sumio
- Okada, T
- Okada, Toyohi
- Okada, Y
- Okada, Yaichiro
- 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, Ken-Ichi
- Okamoto, Kiyoshi
- Okamoto, Marcelo H
- Okamoto, Marcelo H.
- Okamoto, Mitsumasa
- Okamoto, Sumito
- Okamoto, Takashi
- Okamoto, Taku
- Okamura, B
- Okamura, Beth
- 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, 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, 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. (Wazir), 1943-
- Okethuwengu, Geoffrey
- Okey, Charles W. (Charles William), 1886-
- Okey, E N
- Okey, Thomas, 1852-1935
- 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.
- Oklahoma. Department of Wildlife Conservation.
- Oklahoma. State Board of Agriculture,
- Okoda, Yô K
- Okolodkov, I︠U︡riĭ B
- Okoniewski, J C
- Okoni-Williams, Arnold
- Okoshi, Kenji
- Okoyama, S
- Oksnebjerg, B
- Oktay, H Imge
- Oku, Johei
- Okuda, Hélio T.
- Okuda, Kazuo
- Okuda, Kyosuke
- Okuda, Takashi
- Okulitch, Vladimir J. 1906-
- Okuma, Jiro
- Okumoto, Naoto
- Okumura, George T.,
- Okumura, Ken-Ichi
- Okumura, Takuji
- Okuno, J
- Okuno, Junji
- Okuno, Makoto
- Okura, Nobuhiko
- Okusu, Akiko
- Okutaner, Atılay
- Okutani, Takashi
- Olabarria, C
- Olabarria, Celia
- Olabuenaga, Susana E.
- Olaciregui, Christian
- Olaciregui, Christian A
- Olaf J. Wingren (Firm)
- Olafsdottir, Steinunn Hilma
- Olague Ramirez, Jesús
- Oláh, János
- Olajuyigbe, O O
- Olajuyigbe, O. O.
- Olalde Portugal, V
- Olalde, V
- OlalekanAdebiyi Abdul-Hakeem
- Olalla, A. M.
- Olander, C. P.
- Olaniyi, Ajibola A.
- Olariaga, I
- Olarte, Luis G.
- Olaus, Magnus, Archbishop of Uppsala, 1490-1557
- Olavarría, Carlos
- Olave, Anabel
- Olave, Carlos
- Olavo, George
- Olaya Restrepo, Julián
- Olazarri, Jose
- Olbers, W. 1758-1840
- Olbrich, E. R.
- Olbrych, Katarzyna
- Olcott, Henry Steel, 1832-1907
- Old Baldy Nurseries.
- Old Bee-keeper
- Old bushman, 1815-1865
- Old Calabar.
- Old Cambridge Shakespeare Assoc.
- Old Capital Nurseries.
- Old club, Detroit.
- Old Colony Gardens,
- Old Colony Nurseries.
- Old Colony Nursery.
- Old Dominion Gardens.
- Old Dominion Nurseries.
- Old Dominion University. Dept. of Biological Sciences.
- Old English Nursery.
- Old Fort Camellia And Azalea Nursery,
- Old Guard, pseud.
- Old House Gardens.
- Old Kent Nursery.
- Old Line Cactus Company,
- Old Orchard Gardens (Webster Groves, Mo.)
- Old Orchard Gardens.
- Old Rose Nursery.
- Old Seed House.
- Old Shekarry.
- Old Spanish Trail Orchard and Nursery.
- Old Town Nurseries.
- Old Trail Dahlia Gardens.
- Old West Regional Commission.
- Old, K M
- Old, Richard R
- Old, William E. Jr.
- Oldaker, Frank
- Oldani, Norberto
- Oldani, Norberto Oscar
- Oldberg, Rudolf, 1850-1898
- Olde, P M
- Olde, Peter Maurice
- Oldekop, G
- Oldeman, Roelof A A
- Oldemeyer, John. L.
- Olden Nursery Co.
- Olden, G A
- Olden, Julian
- Oldenberg, L
- Oldenberg, Lorenz
- Oldenbourg, R.
- Oldenburg, Henry, 1615-1677
- Oldenburg, Lorentz
- Oldenburg, R.
- Oldenburger, F H F
- Oldendorp, C. G. A. (Christian Georg Andreas), 1721-1787
- Oldenland, Henrik Bernard, approximately 1663-1697
- Old-Fashioned Gardens.
- Oldfield, R. A. K.
- Oldfield, Ron
- Oldfield, S.
- Oldfield, S., WCMC
- Oldfield, Sara
- Old-Growth Definition Task Group.
- Oldham, Charles
- Oldham, Jonathan A
- Oldham, Michael J.
- Oldham, R D