Ronald Leigh-Hunt trained for acting at the Italia Conti School. He made his debut in regional repertory theatre. In films from 1950, he was rarely out of work, usually cast in subtle authoritarian or aristocratic roles. Cultured and dapper, latterly white-haired, he was particularly noted for his resonant voice (outside of acting, he sidelined in training business leaders in public speaking), impeccable manner and stylish attire.

Though very often only in small supporting roles, Leigh-Hunt was seen in several big budget features, ranging from Khartoum (1966) to The Omen (1976). He also played Florenz Ziegfeld Jr., opposite Barbra Streisand, in the West End production of 'Funny Girl' in 1966. On the small screen, he was a popular guest star in just about every major British television series, frequently popping up on Z Cars (1962) and Doctor Who (1963). He also had a recurring role, starring as Colonel Buchan, in the children's TV series Freewheelers (1968). Ronald was a cousin of the actress Barbara Leigh-Hunt.