Books ordered by title: I
| Author | Title (Number of quotes) |
| Annaka Harris | I Wonder (3) |
| Isaac Asimov | I, Robot (2) |
| Richard Bach | Illusions (4) |
| Isaac Asimov | In the Beginning (2) |
| Mother Teresa | In the Heart of the World (2) |
| Christopher Paolini | Inheritance (4) |
| Meg Cabot | Insatiable (2) |
| Stephen King | Insomnia (3) |
| Oscar Wilde | Intentions (2) |
| Terry Pratchett | Interesting Times (2) |
| Anne Rice | Interview with the Vampire (2) |
| Daniel Dennett | Intuition Pumps and Other Tools for Thinking (12) |
| Chuck Palahniuk | Invisible Monsters (6) |
| Stephen King | It (6) |