Richard K. Guy (1916–2020) was a British mathematician.
Richard Guy may also refer to: Richard Guy (footballer) (1880–1938), English footballer Richard P. Guy (1932–2025), American judge Dick Guy (1937–2018), Australian cricketer Richie Guy (born 1941), New Zealand rugby player and administrator Dickie Guy (Richard John Guy, born 1949), English football goalkeeper
See also Guy A. Richard (born 1932), Canadian lawyer Guy Richards (born 1983), Australian rules footballer