Grimmett is a surname. Notable people with the surname include:
Bill Grimmett (born 1956), Canadian politician Clarrie Grimmett (1891–1980), New Zealand-born Australian cricketer Geoffrey Grimmett (born 1950), English mathematician working in probability theory Steve Grimmett (1959–2022), British heavy metal vocalist
See also Grimma Grimme Grimmen Grimms Grommet