Knockout was a weekly comic published by Amalagamated Press, later Fleetway and IPC, launched in March 1939. It absorbed The Magnet in 1940 and Comic Cuts in 1953, and was merged into Valiant in February 1963. Strips included:
- Battler Britton
- Blarney Bluffer
- Billy Bunter by Charles Chapman
- Davy Crockett
- Deed-a-Day Danny by Hugh McNeill
- Firebrand the Red Knight
- Hopalong Cassidy
- Jimmy Silver
- Johnnie Wingco - master pilot
- Our Ernie by C. E. Holt
- Sexton Blake by Joseph Walker
- Sinbad Simms
- Space Family Rollinson by Graham Coton
- Sporty
- Stonehenge Kit (later Spaceage Kit)
- Thunderbolt Jackson
The title was revived for a new humour comic, published from June 1971 to June 1973, when it merged into Whizzer and Chips. Strips included:
- Beat Your Neighbour
- Boney
- Booter
- Dead Eye Dick
- Fuss Pot
- Joker
- Pete's Pockets
- Sammy Shrink
- Stinker
- The Group
- The Haunted Wood
- The Super Seven
- The Toffs and the Toughs
- Thunderball
- Wanda Wheels
- Whistler
- Windy