Denis Cannan (14 May 1919 – 25 September 2011) was a British dramatist, playwright and script writer. Born Denis Pullein-Thompson, the son of Captain Harold J. Pullein-Thompson and novelist Joanna Cannan, he changed his name by deed poll in 1964. His younger sisters were Josephine, Diana and Christine Pullein-Thompson.Born in Oxford, he was educated at Eton College.