- I. & J. L. Leonard (Firm)
- I. E. Bass & Son Pecan Co.
- I. G. Hubbard (Firm)
- I. Hicks & Son.
- I. U. Flower Fields.
- I. V. Faust (Firm)
- I.E. Bass & Son Pecan Co.
- I.E. Bass & Sons Pecan Company.
- I.E. Ilgenfritz & Sons.
- I.E. Ilgenfritz' Sons Company.
- I.F. Stiler (Firm)
- I.J. Simonson (Firm)
- I.L. Radwaner Seed Co.
- I.L. Radwaner Seed Co.,
- I.L. Radwaner Seed Co., Inc.
- I.L. Williams (Firm)
- I.N. Brown (Firm)
- I.N. Kramer & Son.
- I.N. Simon & Son.
- I.S. Hendrickson (Firm)
- I.W. Alexander (Firm)
- I.W. Scott & Co.
- I.W. Scott Company.
- I.W. Tegner & Kittendorf,
- I.X.L. Gardens (Firm)
- I︠A︡blokov, A. V. (Alekseĭ Vladimirovich)
- I︠A︡blokov-Khnzori︠a︡n, S. M (Stepan Mironovich)
- I︠A︡chevskiĭ, A. A. (Artur Arturovich), 1863-1932
- Iaciofano, Davide
- Iack Ximenes, Gilson Evaristo
- Iacolina, Laura
- Iakobson, G. G. (Georgiĭ Georgievich), 1871-1926
- Iakovenko, Nataliia
- I︠A︡kovlev, G. P. (Gennadiĭ Pavlovich)
- I︠A︡kovlev, N. N. (Nikolaĭ Nikolaevich) 1870-1966
- I︠A︡kovlev, S. A. (Sergeĭ Anatolʹevich)
- Iamamoto, Keila
- Iamonico, Duilio
- Iamonte, Mônika
- Iankoshvili, Giorgi
- Iannacone Oliver, José.
- Iannella, Mattia
- Iannilli, Valentina
- Iannone, Basil V., III
- Iannone, Leopoldo
- Iannuzzi, Luciana
- Iannuzzi, Roberto
- Iantas, Jucélia
- I︠A︡roshenko, P. D. (Pavel Dionisʹevich), 1906-
- Iaroshynska, Olena
- Iavorschi, Vasilica
- Ibacache, Eric
- Ibala Zamba, Armel,
- Ibáñez Bernal, Sergio.
- Ibañez D., Roberto.
- Ibáñez Genís, Miguell
- Ibáñez, Alicia
- Ibáñez, Ana L.
- Ibáñez, Carlos
- Ibáñez, Christian M
- Ibáñez, Eliana
- Ibanez, J C
- Ibañez, Jayson C
- Ibañez, Lucía M
- Ibañez, Maria do Socorro Rodrigues
- Ibañez, Mercedes
- Ibáñez, Neus, 1976-
- Ibanez, Pedro
- Ibáñez, Sergio T.
- Ibáñez, Sergio.
- Ibañez-Cervantes, Gabriela
- Ibanez-Hernandez, Gabriela
- Ibara, Yasushi
- Ibarra Balcazar, R
- Ibarra de Anda, F.,
- Ibarra Jimenez, Sebastian
- Ibarra Juárez, Luis Arturo
- Ibarra Rangel, Jose Luis
- Ibarra, Ana C.
- Ibarra, Claudia
- Ibarra, Jimena
- Ibarra, José Tomás
- Ibarra, Lalo
- Ibarra, Mauricio A
- Ibarra, Myriam
- Ibarra-Castro, Leonardo
- Ibarra-Gámez, José Cuauhtémoc
- Ibarra-Grasso, Addalberto
- Ibarra-Juárez Luis A.
- Ibarra-Junquera, Vrani
- Ibarra-Manríquez, Guillermo
- Ibarra-Núñez, Guillermo
- Ibarra-Obando, Silvia E
- Ibarra-Polesel, Mario G.
- Ibarra-Vidal, Héctor
- Ibarra-Zatarain, Zohar
- Ibarzabal, Diana R
- Ibbetson, A.
- Ibbetson, Julius, 1759-1817
- Ibbetson, R
- Ibbotson, Henry, 1886
- Ibelli, Sonia
- Ibelli, Tatiana
- Iberico, Gustavo
- Iberite, Mauro
- Ibero, C
- Iberti, M.
- IBI Group.
- Ibmayer, Johann
- Ibn al-Quff, Yaʻqūb ibn Isḥāq, 1233-1286
- Ibn al-Tilmīdh, Hibat Allāh ibn Ṣāʻid, 1073 or 1074-1164 or 1165
- Ibn Tattou, Mohamed
- Ibragimova, Sohiba
- Ibrahim, Abdel A
- Ibrahim, Abubakar
- Ibrahim, Adel A
- Ibrahim, Adriana N.A. Fattah
- Ibrahim, Amr Aly Hassan
- Ibrahim, Ayman
- Ibrahim, Dahiratou
- Ibrahim, Halijah
- Ibrahim, Hamid
- Ibrahim, Hassan A.H
- Ibrahim, K H
- Ibrahim, Kamal M.,
- Ibrahim, Nizar
- Ibrahim, Nur Fazne
- Ibrahim, Yusof
- Ibrahimi, Halil
- Ibryamova, Sevginar
- Icaza, Isidro Ignacio de.
- Icenogle, Wendell R
- Ichaso, Carmen Lúcia Falcão, 1940-
- Iches, Lucien
- Ichiishi, Wataru
- Ichikawa, K
- Ichikawa, M
- Ichikawa, Mamori
- Ichikawa, Raijirō.
- Ichikawa, Tomoyuki
- Ichikawa, Toshio
- Ichimura, T
- Ichinose, Katsuya
- Ichinotsubo, Dana
- Ichiye, Takashi, 1921-
- Ichthos (Organization)
- Ickeringill, R
- Ickert-Bond, Stefanie M
- Ickes, Kalan
- Ickes, Roy A
- Ick-Hewins, T J
- Ickis, Marguerite, 1897-1980
- Ickrath, Hugo
- Icochea, Javier.
- Idaho Coal & Seed Co.
- Idaho Cooperative Fish and Wildlife Research Unit.
- Idaho Native Plant Society.
- Idaho Native Plant Society. Pahove Chapter.
- Idaho Panhandle National Forests.
- Idaho Panhandle National Forests. Sandpoint Ranger District.
- Idaho Panhandler National Forests.
- Idaho Pear Company.
- Idaho Power Company.
- Idaho State Conservation Effort.
- Idaho State Nursery.
- Idaho State University.
- Idaho State University. Department of Biological Sciences.
- Idaho. Department of Agriculture.
- Idaho. Department of Fish and Game.
- Idaho. Department of Fish and Game. Magic Valley Region.
- Idaho. Dept. of Fish and Game.
- Idaho. Dept. of Parks and Recreation.
- Idaho. Fish and Game Department.
- Idaho. Fish and Game Dept.
- Idaho. Natural Resource Policy Bureau.
- Idaho. State board of horticultural inspection.
- Idalgo, Thiago D. N.
- Idar, Mathias
- Idardare, Zaina
- Idárraga, Alvaro
- Idárraga-García, Javier
- Idczak, Elke
- Iddings, Harriet J. Retzer.
- Iddings, Joseph Paxson, 1857-1920
- Ide, Buck
- Ide, F. P.
- Ide, G S
- Ide, Sandra
- Ide, Sergio
- Ideal Fruit Farm.
- Ideal Nursery & Orchard Co.
- Ideker, Joe
- Idiiatullina, Sabira
- Idle Hour Nurseries.
- Idoeta, Fabricio M
- Idrees, Muhammad
- Idrees, Nabila
- Idris, A B
- Idris, Izwandy
- Idris, Mohamed A
- Idris, Muhammad
- Idrobo, Jesus M
- Iean Pillehotte.
- Iede, Edson Tadeu
- Iemma, Luis Gustavo Rodrigues
- Ienistea, Mircea-Alexandra
- Ienne, Susan
- Ieno, Elena
- Iepure, Sanda
- Ieradi, Luisa Anna
- Iezhova, Tatjana A
- Iffat, Fehmida
- Ifft, John D
- Iftikhar, Ali Khan
- Iftikharand, Farida
- Iftner, David C. (David Carl), 1950-
- Iga, Chie
- Iga, Tetsuro
- Iganci, João Ricardo Vieira
- Igarashi, Shin-Ichi
- Igarzabal, Daniel
- Igdoura, Suleiman
- Igel, Benzion
- Igersheim, Anton
- Iggulden, May,
- Igl, Lawrence D
- Iglesias Andreu, Lourdes Georgina
- Iglesias Hernández, Jesús A.
- Iglesias, ALG
- Iglesias, Ari
- Iglesias, C
- Iglesias, C G
- Iglesias, C Lopez
- Iglesias, Javier
- Iglesias, José Manoel Pires
- Iglesias, María del Rosario
- Iglesias, Mónica
- Iglesias, Patricia P.,
- Iglesias, Ricardo
- Iglesias-Rios, Ricardo
- Iglseder, F. X.
- Ignace, David
- Ignácio, Áurea R A
- Ignácio, Juliana Martinhão
- Ignacio-Apaza, Javier
- Ignatieff, Vladimir,
- Ignatijeva, Ekaterina I.
- Ignatius, Saint, Bishop of Antioch, approximately 110
- Ignatova-Ivanova, Tsveteslava
- Ignatti, Ana Cristina