Knockout Kings 2000 (known as Box Champions 2000 in Germany) is a video game developed by Black Ops Entertainment and published by EA Sports for Nintendo 64, PlayStation, and Game Boy Color (the latter as simply Knockout Kings) in 1999.

Knockout Kings 2000 features 25 boxers, including Muhammad Ali and Sugar Ray Leonard, and includes the ability to design custom fighters.

A pound for pound boxing arcade style where players can play any of these three modes: Championship, Slugfest, and Training. The "Super Punch" is used where players can instantly knock down his opponent to the floor.