M
- M. L. Carr (born 1951), American NBA & ABA basketball player, and head coach & GM for the Boston Celtics
- Marina Carr (born 1964), Irish playwright
- Martin Carr (born 1968, chief songwriter & lead guitarist with the British band, The Boo Radleys
- Matthew Carr (born 1978), Australian rules footballer
- Maxine Ann Carr (born 1977), English criminal, girlfriend of Ian Huntley (the Soham murderer)
- Michael Carr (disambiguation):
- Michael Carr (Lib Dem politician) (born 1946), British Liberal Democrat politician
- Michael Carr (Labour politician) (1947–1990), British Labour Party politician
- Mike Carr (born 1951), American writer and game designer
- Milton Robert Carr ("Bob"; born 1943), American lawyer & politician from the state of Michigan, U.S. House of Representatives 1975–1995
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