The Dead Moon Circus are a group of fictional characters from the Sailor Moon manga series created by Naoko Takeuchi. They serve as the main antagonists of the fourth arc, called Dream in the manga, Sailor Moon SuperS in its first anime adaptation, and Sailor Moon Eternal in the second anime adaptation. They are first introduced in chapter #39 "Dream 1 – Eclipse Dream", originally published in Japan on September 6, 1995. In the original English dubbed anime by Cloverway, they are called the "Dark Moon Circus".

Sailor Moon is a Japanese manga series written and illustrated by Naoko Takeuchi. It was originally serialized in Kodansha's shōjo manga magazine Nakayoshi from 1991 to 1997; the 60 individual chapters, along with several side stories, were compiled in 18 volumes. The series follows the adventures of a schoolgirl named Usagi Tsukino as she transforms into the eponymous character to search for a magical artifact, the "Legendary Silver Crystal" . She leads a group of comrades, the Sailor Soldiers, called Sailor Guardians in later editions, as they battle against villains to prevent the theft of the Silver Crystal and the destruction of the Solar System.