- Skiel Top
- Skilled Dark Magician
- Skull Archfiend of Lightning
- Skull Conductor
- Skull Guardian
- Skull Knight
- Skull Knight #2
- Skull Kraken
- Skull Servant
- Skull Stalker
- Skull-Mark Ladybug
- Sky Core
- Slate Warrior
- Sleepy Beauty
- Slifer the Sky Dragon
- Slot Machine
- Small Piece Golem
- Smile Angel
- Smile Kid
- Snow Plow Hustle Rustle
- Solar Wind Jammer
- Sonata the Melodious Diva
- Sonic Chick
- Sonic Maid