- I. E. Ilgenfritz Sons Co. (The Monroe Nursery) (1)
- I. V. Morrell (Photographer) (1)
- I.N Kramer & Son (1)
- IIigan, Ralph (4)
- Iannelli, Alfonso, 1888-1965 (11)
- Iantaffi, Alex (1)
- Ibañez e Ibañez de Ibero, Carlos, 1825-1891 (1)
- Ibarra de Botero, Beatriz (1)
- Ibarra, Lina (1)
- Ibrahim, Nur (1)
- Ides, Evert Ysbrandt (1657-1708) (2)
- Ieuan Gwyllt, 1822-1877. (1)
- Iftimie, Dragos (Université Claude-Bernard (Lyon I)) (1)
- Iglesias, Pablo A. (Johns Hopkins University) (1)
- Ignés, Jordi (University of Barcelona) (1)
- Igoshin, Oleg (Rice University) (1)
- Ilda, Paul (1)
- Ilgenfritz Nurseries, Inc. (4)
- Ilic, Marija D. (Carnegie Mellon University) (1)
- Iligan, Ralph, 1894-1960 (3)
