- Red Archery Girl
- Red Dragon Archfiend
- Red Gadget
- Red Nova
- Red Nova Dragon
- Red-Eyes B. Chick
- Red-Eyes B. Dragon
- Red-Eyes Black Metal Dragon
- Red-Eyes Darkness Dragon
- Reed Butterfly
- Reflect Bounder
- Regulus
- Relinquished
- Reptile Gorgon
- Reptilianne Servant
- Rescue Cat
- Rescueroid
- Reshef the Dark Being
- Return Zombie
- Reverse Buster
- Revival Jam
- Right Arm of the Forbidden One
- Right Leg of the Forbidden One
- Road Fighter