Rentoul is a surname. Notable people with the surname include:
Erminda Rentoul Esler, née Erminda Rentoul, (1852? – 1924), Irish novelist Gervais Rentoul (1884–1946), British politician Ida Rentoul Outhwaite, née Ida Rentoul, (1888–1960), Australian illustrator of children's books James Alexander Rentoul (1854–1919), British judge and politician John Rentoul (born 1958), British journalist John Laurence Rentoul (1846–1926), Australian Presbyterian minister and poet