An Inspector Calls is a modern morality play written by English dramatist J. B. Priestley, first performed in the Soviet Union in 1945 and at the New Theatre in London the following year. It is one of Priestley's best-known works for the stage and is considered to be one of the classics of mid-20th century English theatre. The play's success and reputation were boosted by a successful revival by English director Stephen Daldry for the National Theatre in 1992 and a tour of the UK in 2011–2012.

John Boynton Priestley was an English novelist, playwright, screenwriter, broadcaster and social commentator.