| Author Name | Profession | Nationality |
| Iain Banks | Writer | Scottish |
| Iain Glen | Actor | Scottish |
| Ian Allison | Scientist | |
| Ian Fleming | Author | British |
| Ian Gilmour | Politician | English |
| Ian Hacking | Philosopher | Canadian |
| Ian Hamilton Finlay | Poet | Scottish |
| Ian Harding | Actor | American |
| Ian Hart | Actor | English |
| Ian Jackson | Scientist | English |
| Ian St. John | Athlete | Scottish |
| Ibrahim Babangida | Statesman | Nigerian |
| Idi Amin | Statesman | |
| Ieva Laguna | Model | Latvian |
| Igor Ivanov | Statesman | Russian |
| Ilya Ehrenburg | Writer | Ukrainian |
| Immanuel Kant | Philosopher | German |
| Imran Khan | Athlete | Pakistani |
| Imre Lakatos | Philosopher | Hungarian |
| Ina Garten | Author | American |
| Indira Gandhi | Statesman | Indian |
| Indra Devi | Celebrity | Latvian |
| Ingvar Kamprad | Businessman | Swedish |
| Ira Gershwin | Musician | American |
| Ira Glass | Journalist | American |
| Ira Glasser | Activist | American |
| Iris Dement | Musician | American |
| Iris Johansen | Author | American |
| Irvin Kershner | Director | American |
| Irving Babbitt | Critic | American |
| Irving Caesar | Composer | American |
| Irving Fisher | Economist | American |
| Irving Langmuir | Scientist | American |
| Irving Layton | Poet | Canadian |
| Irving R. Kaufman | Judge | American |
| Irwin Edman | ||
| Isaac Albeniz | Musician | Spanish |
| Isaac Babel | Journalist | Russian |
| Isaac Barrow | Mathematician | English |
| Isaac D'israeli | Writer | British |
| Isaac Hanson | Musician | American |
| Isabel Allende | Writer | Chilean |
| Isabella I | Royalty | Spanish |
| Isabelle Adjani | Actress | French |
| Isabelle Eberhardt | Explorer | English |
| Isidore Ducasse Lautreamont | Author | French |
| Isla Fisher | Actress | Australian |
| Islom Karimov | Statesman | |
| Ismail Haniyeh | Politician | Palestinian |
| Isocrates | Writer | Greek |
| Israel Kamakawiwo'ole | Musician | American |
| Italo Calvino | Journalist | Italian |
| Ivan Allen | Politician | American |
| Ivan Illich | Sociologist | American |
| Ivan Lendl | Athlete | Czechoslovakian |
| Ivica Dacic | Politician | Serbian |
| Ivy Lee | Writer | American |
| Iyad Allawi | Statesman | Iraqi |
“When I first came up, the bullpen was pretty much where they put the guys who couldn't start.”