Former U.S. Secretary of State.

Sir Colin Murray Campbell (26 December 1944 – 20 May 2022) was a British academic lawyer who was vice-chancellor of the University of Nottingham from 1988 to 2008.Lucy Hodges, "The academic globetrotter", The Independent, 17 June 2004.

Colin Grant Clark (2 November 1905 – 4 September 1989) was a British and Australian economist and statistician who worked in both the United Kingdom and Australia.

Colin Henry Wilson (26 June 1931 – 5 December 2013) was an English existentialist philosopher-novelist.

Colin Macmillan Turnbull (23 November 1924 – 28 July 1994) was a British-American anthropologist who came to public attention with the popular books The Forest People (on the Mbuti Pygmies of Zaire) and The Mountain People (on the Ik people of Uganda), and one of the first anthropologists to work in the field of ethnomusicology.

Scottish mathematician, Maclaurin series developer.

Colin Carhart McPhee (March 15, 1900 – January 7, 1964) was a Canadian-American composer and ethnomusicologist.

(born July 22, 1972) a Canadian-American actor, director and producer.

Colin Andrew Firth (born 10 September 1960) is an English actor and producer.

Creator of Inspector Morse series.

Colin James Farrell (born 31 May 1976) is an Irish actor.

Colin James Oliver Harrison (18 August 1926 – 17 November 2003) was an English ornithologist.