Donald Esme Clayton Calthrop (11 April 1888 – 15 July 1940) was an English stage and film actor.

[1] Born in London, Calthrop was educated at St Paul's School and made his first stage appearance at eighteen years of age at the Comedy Theatre, London.

He starred as the title character in the successful musical The Boy in the same year.

He died in Eton, Berkshire from a heart attack while he was filming Major Barbara (1941).

[2] According to Ronald Neame in his autobiography, some shots in the final film had a stand-in playing Calthrop's role (from the back) and a piece of dialogue was recorded using an unnamed person who impersonated Calthrop's voice.