Quotation authors by 'I'
| Full name | Nationality | Profession |
|---|---|---|
| Muhammad Iqbal | Pakistani | Poet |
| Natalie Imbruglia | Australian | Musician |
| Neil Innes | British | Writer |
| Niger Innis | American | Activist |
| Oscar Isaac | Guatemalan | Actor |
| Patricia Ireland | American | Activist |
| Paul Ince | English | Athlete |
| Pico Iyer | Indian | Writer |
| Rhys Ifans | Welsh | Actor |
| Robert Green Ingersoll | American | Lawyer |
| Robert Indiana | American | Artist |
| Robert Irvine | English | Chef |
| Robert Irwin | American | Artist |
| Robin Ince | English | Comedian |
| Saint Ignatius | Spanish | Saint |
| Samantha Isler | American | Actress |
| Scott Ian | American | Musician |
| Sheena Iyengar | American | Educator |
| Silius Italicus | Poet | |
| Sri Mulyani Indrawati | Indonesian | Economist |