Quotation authors by 'I'
| Full name | Nationality | Profession |
|---|---|---|
| Steve Irwin | Australian | Scientist |
| Steve Israel | American | Politician |
| Thomas R. Insel | American | Scientist |
| Tokugawa Ieyasu | Japanese | Leader |
| Tony Iommi | English | Musician |
| Toyo Ito | Japanese | Architect |
| Vanilla Ice | American | Musician |
| Walter Isaacson | American | Writer |
| Washington Irving | American | Writer |
| William Ralph Inge | English | Clergyman |
| Zeljko Ivanek | Slovenian | Actor |