Knockout may refer to one of two British comics. The original series, published by the Amalgamated Press (later Fleetway Publications), started on 4 March 1939 and ended on 16 February 1963, when it merged with Valiant. The second series, published by IPC Magazines, ran from 12 June 1971 to 23 June 1973, when it merged with Whizzer and Chips.