Sei Young Animation Co., Ltd.

 was a South Korean animation studio that worked on both Japanese and American productions. It was often used by DIC Entertainment in the late 1980s to early 1990s. The company merged with the cel distributor The Island Corporation in 1993 to form the short-lived Animagic Studio Inc.

Sei Young animated The Super Mario Bros. Super Show!, The Adventures of Super Mario Bros. 3, and The Legend of Zelda. The animation for Super Mario World was instead done by Pacific Rim Productions, Inc.