Clinton Greyn (29 September 1936) is a Welsh-born actor noted for his appearances in British television series of the sixties and seventies.

He made his film debut in the 1961 short Wings of Death, and went onto appear in such popular British TV series as Z Cars and Compact. His career progressed to a prominent role opposite Stanley Baker in Peter Yates' crime caper Robbery (1967). This led to him getting his own TV series in 1968, Virgin of the Secret Service, in which he played the dashing Captain Robert Virgin, travelling the world battling evil in the name of the British Empire. The series was not a success and he found himself making guest appearances in other adventure series, such as The Champions; Department S; and UFO.