- Kuribee
- Kuribeh
- Kuriboh
- Kuribon
- Kuriboo
- Kuriphoton
- Kurivolt
- La Jinn the Mystical Genie of the Lamp
- Labyrinth Tank
- Labyrinth Wall
- Lady of Faith
- Lady Panther
- Lancelot, Knight of the Lake
- Lancer Archfiend
- Laplace the Fiend Mathematician
- Larvae Moth
- Last Tusk Mammoth
- Launcher Spider
- Lava Battleguard
- Lava Golem
- Lazion, the Timelord
- Left Arm of the Forbidden One
- Left Leg of the Forbidden One
- Legendary Fiend