Charles William Key, PC (8 August 1883 – 6 December 1964) was a British schoolmaster and politician. Coming from a very working-class background, the generosity of a family friend made it possible for him to get a start in life and train as a teacher; he entered politics through Poplar Borough Council, and was elected to Parliament to replace George Lansbury. Serving in junior posts during the Attlee government, he remained in Parliament until the age of 81.