The Hellfire Club is a satanist cult.
Committing a string of ritual murders, the Hellfire Club disbanded, having not been active in more than a decade. A hatchet with their initials on it was discovered by Detective Jim Gordon and Dr. Leslie Thompkins which was thrown off of Arkham Bridge by Jerome Valeska in an attempt to throw off the authorities to the fact that he had killed his mother Lila Valeska, with it.
- "The Blind Fortune Teller" (mentioned)
- The historical Hellfire Club was an umbrella term for a number of places around London where members of the upper class gathered to indulge in immoral and illegal acts in the 18th century. In comics, the Hellfire Club is a Marvel Comics grouping of supervillains who look to influence and control business and politics around the world.