- Sinister Sprocket
- Skelengel
- Skiel A3
- Skiel A5
- Skiel Carrier
- Skiel Carrier 3
- Skiel Carrier 5
- Skiel Guard
- Skiel Top
- Skill Drain
- Skill Successor
- Skilled Dark Magician
- Skull Archfiend of Lightning
- Skull Conductor
- Skull Dice
- Skull Guardian
- Skull Knight
- Skull Knight #2
- Skull Kraken
- Skull Servant
- Skull Stalker
- Skull-Mark Ladybug
- Sky A3
- Sky Core