The term "Clown" may refer to a variety of subjects:
- Clown (Species): The Clowns are beings which are the contagion and the physical form of fear itself and serve the purpose of protecting Asura as well as spreading Madness. They form the Clown Army.
- Clown (Character): The Clown may also refer to the character only known as "Clown". This was the one to attempt to infect Maka Albarn and is the main perpetrator in turning Justin Law mad.
- Mechanical Clowns: These are the "Clowns" who appeared in the anime and are based off the manga's Clowns, although appear to be robotic similar to the likes of Demon Tool Soldiers. They were built to protect the Magic Tool Eibon, also known as the Key, from falling into the wrong hands.