Jean-Claude Magnum is a character in the Yu-Gi-Oh! anime. He is a Hollywood actor who has starred in several ninja movies. He was a suitor and opponent of Mai Valentine.
Magnum entered Battle City and won five Locator Cards. Needing six to qualify for the finals, he challenged Mai to a Duel for a final Locator Card and the right to marry her. When he lost, he used Hollywood stunts and special effects in an attempt to kidnap her.