Knock Out is a pinball machine designed by Harry Mabs and released by Gottlieb on March 19, 1950.

The game was marketed with the slogan: "Uproarious Slam-Bang Animation in a Real Ring on the Playfield".

The machine has well made artwork and a mechanical animation of two boxers and a referee inside a boxing ring on the playfield.

[3][4] A knockout can be achieved by completing the 1 through 5 bumpers scores or hitting the 1-3 and 3-5 targets, as well as the left and right lanes and the rollover button, when lit.

By rolling through the right or left lane twice, the big money shot is lighting the right and lift saucers for 500k.