The Dead Moon Circus (デッドムーンサーカス, Deddo Mūn Sākasu) are a group of fictional antagonists 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 and Sailor Moon SuperS in its first anime adaptation. They are first introduced in chapter #34 "Dream 1 – Eclipse Dream", originally published in Japan on September 6, 1995. In the English dubbed anime, they are called the "Dark Moon Circus".

The Dead Moon Circus is led by the twisted Zirconia, in command by the absence of the dark Queen Nehelenia who is trapped within a mirror. Zirconia is searching for the legendary Golden Crystal or golden starseed, which will allow Nehelenia to break free of her entrapment and take over the Earth. They are the only group of villains with two subordinate groups: the Amazon Trio and the Amazoness Quartet.

Key figures

Zirconia

Zirconia (ジルコニア, Jirukonia) appears as an insectlike old woman with lavender skin. Secondary to Queen Nehelenia, she controls the Amazoness Quartet and the Amazon Trio. Her name is derived from the mineral Zirconium dioxide, which is often called Zirconia. She first appears in Episode 128 of the anime and Act 34 of the manga, her connection to Nehelenia varying. In the English-language adaptation, Zirconia's gender was changed from female to male.