Authors: I
| Author (number of quotes) | Description |
| Ia | |
| Iacocca, Lee (2) | American businessman |
| Ib | |
| Ibrahimovic, Zlatan (1) | Swedish footballer |
| Ibsen, Henrik (1) | Norwegian author |
| Ig | |
| Iglesias, Enrique (1) | Spanish singer |
| Il | |
| Iles, George (1) | American author |
| In | |
| Ingersoll, Robert G. (8) | American political leader |
| Ir | |
| Irving, John (1) | American novelist |
| Irving, Washington (2) | American author and historian |
| Irwin, Ashton (1) | Australian musician |
| Is | |
| Isherwood, Christopher (1) | |
| It | |
| Ito, Joi (1) | Japanese-American activist, entrepreneur, venture capitalist |
| Iv | |
| Ivins, Molly (1) | pen name of Mary Tyler Ivins, American newspaper columnist, author, political commentator, and humorist |
| Iy | |
| Iyer, Pico (2) | full name Siddharth Pico Raghavan Iyer, British-born essayist and novelist of Indian origin |