Thou Art the Man is a 1920 American silent drama film produced by Famous Players–Lasky and released through Paramount Pictures.

Thomas N. Heffron directed the film which starred stage and matinee idol Robert Warwick and Lois Wilson.

[4] Based upon a description in a film publication,[5] Myles Calthrope (Warwick) is an English soldier of fortune who drifts into the diamond mining fields of South Africa and finds employment with some diamond smugglers who masquerade as feather merchants.

The police arrest Myles in an illicit enterprise of which he has no knowledge, and he goes to prison for three years.

Eventually the real criminals are arrested, and Myles finds happiness with Joan.