| Author | Profession | Birth date | Death date |
|---|---|---|---|
| I. A. R. Wylie | Novelist | March 16, 1885 | November 4, 1959 |
| I. A. Richards | February 26, 1893 | September 7, 1979 | |
| I. Bernard Cohen | Author | March 1, 1914 | June 20, 2003 |
| I. F. Stone | American Journalist | December 24, 1907 | July 17, 1989 |
| I. J. Good | Mathematician | December 9, 1916 | April 5, 2009 |
| I. K. Gujral | Former Prime Minister of India | December 4, 1919 | November 30, 2012 |
| I. King Jordan | American Educator | June 16, 1943 | |
| I. L. Peretz | Author | May 18, 1852 | April 3, 1915 |
| I. M. Pei | American Architect | April 26, 1917 | |
| Iain Banks | Scottish Writer | February 16, 1954 | June 9, 2013 |
| Iain Benson | 1955 | ||
| Iain De Caestecker | Scottish Actor | 1987 | |
| Iain Dowie | Football manager | January 9, 1965 | |
| Iain Duncan Smith | British Politician | April 9, 1954 | |
| Iain Glen | Scottish Actor | June 24, 1961 | |
| Iain Hewitson | Chef | October 4, 1948 | |
| Iain Lawrence | Author | February 25, 1955 | |
| Iain Matthews | Musician | June 16, 1946 | |
| Iain McGilchrist | British Writer | ||
| Iain Pears | Novelist | 1955 | |
| Iain Sinclair | British Writer | June 11, 1943 | |
| Iamblichus | Philosopher | 245 | 325 |
| Ian Allison | Scientist | ||
| Ian Anderson | British Musician | August 10, 1947 | |
| Ian Anthony Dale | American Actor | July 3, 1978 | |
| Ian Astbury | Musician | May 14, 1962 | |
| Ian Axel | American Musician | March 28, 1985 | |
| Ian Ayres | Economist | 1959 | |
| Ian Baker-Finch | Golfer | October 24, 1960 | |
| Ian Bannen | Character actor | June 29, 1928 | November 3, 1999 |
| Ian Barbour | Scholar | October 5, 1923 | December 24, 2013 |
| Ian Beattie | Irish Actor | ||
| Ian Blair | Policeman | March 19, 1953 | |
| Ian Bogost | Video Game Designer | December 30, 1976 | |
| Ian Bohen | Actor | September 24, 1976 | |
| Ian Botham | English Athlete | November 24, 1955 | |
| Ian Bremmer | Political Scientist | November 12, 1969 | |
| Ian Brennan | Television writer | 1978 | |
| Ian Brodie | Political Scientist | July 25, 1957 | |
| Ian Brown | Musician | February 20, 1963 | |
| Ian Bryce | 1956 | ||
| Ian Buruma | Writer | December 28, 1951 | |
| Ian C. Esslemont | Writer | 1962 | |
| Ian Caldwell | American Novelist | March 18, 1976 | |
| Ian Callaghan | Footballer | April 10, 1942 | |
| Ian Cawsey | British Politician | April 14, 1960 | |
| Ian Chappell | Cricketer | September 26, 1943 | |
| Ian Christe | Author | 1970 | |
| Ian Christie | Film scholar | February 23, 1945 | |
| Ian Cohen | Australian Politician | June 5, 1951 |