Arnold Diamond (18 April 1915 – 18 March 1992) was an English character actor, regularly cast in small parts on television. He graduated from RADA in 1936, and his stage work included the RSC, and three years in Agatha Christie's The Mousetrap in the West End (1954-1957). In a long career, he was cast in a variety of roles, but frequently in 'foreigner' roles, and often as policemen. Indeed, his most remembered role is probably that of Colonel Latignant in the 1960s ITC series The Saint with Roger Moore. The character of Latignant was one of the few recurring characters in the series' long run.