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- Isaac, Victoria J.
- Isaac, Wm Edwyn 1905-1995
- Isaaco, an African, Mungo Park's guide.
- Isaacs, E
- Isaacs, John D.
- Isaacs, Rufus
- Isaacs, S W
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- Isaacson, H. E.
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- Isacch, Juan P
- Isaia, Marco
- Isaias, Rosy Mary dos Santos
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- Isakar, Mare
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- Isaksson, Mats
- Isaldo, Diego I.
- Isaman, S. George
- Isarain Chávez, Eloy
- Isasawin, Siriwan
- Isasmendi, Sara Celina
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- Isbell, C J
- Isbell, Forest
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- Isbrücker, I J H
- Ischinger, Lee S
- Ise, John, 1885-
- Ise, Yuji
- Iselin, Columbus O'Donnell, 1904-
- Isely, Duane
- Isely, Dwight, 1887-1974
- Isely, Frederick B., 1873-
- Isenberg, Irving H
- Isenberg, Tobias
- Isenbügel, E
- Isenflamm, Jacob Friedrich, 1726-1793
- Isensee, Ruth
- Iserhard, Cristiano Agra
- Isermann, Maike
- Isernhagen, Ingo
- Isert, Arthur
- Isert, Paul Erdmann, 1756-1789
- Iseto, Tohru
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- Isetti, Giovanni
- Isetti, Giuseppe
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- Ish Pashuṭ.
- Ishag, Alrabea
- Ishak, Shah-Fadir
- Isham, Charles
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- Ishaq, Aamna
- Ishaq, Kazima
- Ishaq, Muhammad
- Ishara, Katia Losano
- Ishayeva, Anel A.
- Isherwood, I S
- Ishiata, George
- Ishibashi, Satomi
- Ishibashi, Takeshi
- Ishibashi, Yasuyuki
- Ishida, Cecília M.
- Ishida, Françoise
- Ishida, Hideki
- Ishida, Hiroaki
- Ishida, Hiroshi
- Ishida, Keisuke
- Ishida, Teruo
- Ishida, Y. G.
- Ishida, Yoshiaki
- Ishigaki, Ken-Ichi
- Ishihara, Katsutoshi
- Ishihara, Teruhito
- Ishihara, Yoshimi
- Ishii, Iria Hiromi
- Ishii, Junko
- Ishii, Kazuhiro
- Ishii, Kiyoshi
- Ishii, Mamoru
- Ishii, Nobuo
- Ishii, Susumu
- Ishii, Teruhisa
- Ishijima, Sanae A
- Ishijima, Sumio
- Ishikawa, Atsushi
- Ishikawa, Carlos Massatoshi
- Ishikawa, Chiyomatsu 1860-
- Ishikawa, Hajime
- Ishikawa, Hiroshi
- Ishikawa, Kanga, 1781-1859
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- Ishikawa, M.
- Ishikawa, Makiko
- Ishikawa, Márcia Mayumi.
- Ishikawa, Masamochi, 1754-1830
- Ishikawa, Noemia Kazue
- Ishikawa, Tadashi
- Ishikawa, Tairō, 1766-1817
- Ishikawa, Tatsuya
- Ishikawa, Tomoichi
- Ishikawa, Yuji
- Ishikawa, Yukio
- Ishiki-Ishihara, Mario
- Ishikura, Masaharu
- Ishimatsu, Atsushi
- Ishimatsu, Sadamu
- Ishine, Mieko
- Ishino, MN.
- Ishino, Yoshizumi
- Ishitani, Yoshiyuki
- Ishiwata, Shigetane
- Ishizaka, Joji
- Ishizaki, Hironori
- Ishizaki, Kunihiro
- Ishizaki, Tsuyoshi
- Ishizuka, Hiroshi
- Ishizuka, Ineo
- Ishmael, William E.
- Isht, S Bsomrithipol
- Ishtiaq, Farah
- Ishwar, N M
- Isidor Bush & Co. (Firm)
- Isidoro, Nunzio
- Işik, Hakan
- Işık, Serap
- Isikov, V P
- Işiloğlu, M
- Işiloğlu, Mustafa
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- Isiordia-Aquino Néstor
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- Iskandar, Djoko T
- Iskandar, Johan
- Iskandar, Marianne
- Iskandarov, Abdulla
- Iskandarova, Tukazban
- Iskandarrudin
- Iskaros, Isaac Agaiby
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- Isla, Miguel S
- Islabão, Carolina Antuarte
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- Islam, Kamal
- Islam, M. Zafar-ul
- Islam, Md
- Islam, Md. Rafiqul
- Islam, Melissa B
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- Islam, Muhammad
- Islam, Muhammad
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- Island Camellia Nursery,
- Island Curio (Company)
- Island Home Stock Farm (Grosse Ile, Mich.)
- Island Nurseries and Fruit Farm.
- Island Nursery,
- Island Peony Gardens.
- Island Seed Co.
- Islary, Pungbili
- Islas-Espinoza Marina
- Islas-Tello, Luis
- Islebe, Gerald A.
- Isler, Morton L
- Isler, Phyllis R
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- Isleworth Nurseries.
- Islip, Adam, 1639
- Islomjon, Urinboev
- Ismael, Halgurd Rashed
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- Ismail, A Zainudin
- Ismail, A. L. S.
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- Ismail, Inche'
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- Ismail, Mohamed Abdel-hehim, 1938-
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- Isobe, Mitsui
- Isobe, Yū 1949-
- Isocrono, Deborah
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- Isola, G
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- Isola, Tomas
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- Isomursu, Marja
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- Israel, P
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- Israelson, Spencer.
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- Issel, Raffaele.
- Issel, Willi.
- Issembe, Y
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- Issia, Laura
- Issiaka Joseph, Issiaka Joseph
- Issiki, Kleber