| Author | Titles | | 1.
| Institutul de Istoria Artei G. Oprescu al Academiei Române | 1 | | 2.
| Instituut Beeldend Kunstonderwijs van de Vlaamse Gemeenchap, Bruxelas) | 1 | | 3.
| Insúa, Albert | 1 | | 4.
| Insúa, Juan | 2 | | 5.
| Insuelas, João Baptista Lourenço | 1 | | 6.
| Insulano, Antero, pseud. | 0 | | 7.
| Author is: Quental, Antero de, 1842-1891 | 109 | | 8.
| Intemporal (Lisboa, Portugal) | 1 | | 9.
| Inter-American Development Bank Cultural Center (Washington D.C., Estados Unidos) | 1 | | 10.
| Interart Gallery (Heeswijk, Holanda) | 1 | | 11.
| Inter-Atrium (Porto, Portugal) | 7 |
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