- Hook the Hidden Knight
- Horned Saurus
- Horse of the Floral Knights
- Hydrogeddon
- Hyper Hammerhead
- Hyper-Ancient Shark Megalodon
- Hypnocorn
- Ice Beast Zerofyne
- Ice Hand
- Ice Knight
- Icebergdon
- Ido the Supreme Magical Force
- Illegal Keeper
- Illusion Brigadier
- Illusion Ice Sculpture
- Indestructible Airship Hindenkraft
- Infection Fly
- Infernal Blasthound
- Infernal Dragon
- Infernal Flame Emperor
- Infernal Incinerator
- Infernalqueen Archfiend
- Infernity Archfiend
- Infernity Beast