Harold Lang (1923 – 16 November 1970) was a RADA-trained British character actor of stage and screen. During the 1950s, in particular, played many sly or menacing roles in B-films. At one time managed his own theatrical company. From 1960, Lang, a devotee of Stanislavski, also taught acting at Central School of Speech and Drama; and director John Schlesinger filmed his work in a documentary, The Class, for BBC TV's Monitor, in 1961.