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- Richard Allen (politician) (born 1929), Canadian politician
- Richard V. Allen (born 1936), American National Security Advisor under President Ronald Reagan
- Richard Allen (bishop) (1760–1831), African-American bishop, founder of AME Church
- Dick Allen (born 1942), American baseball player
- Richard Allen (field hockey) (1902–1969), Indian field hockey player
- Richard Allen (abolitionist) (1803–1886), draper, philanthropist and abolitionist in Dublin
- Richard L. Allen (1803-1869), United States agricultural writer
- Richard William Allen (1820–1955), English mechanical engineer
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