The Marauders refers to one of two teams of fictional characters appearing in American comic books published by Marvel Comics. The original Marauders team included mutant warriors and assassins employed by the X-Men's enemy Mister Sinister, a mad scientist villain often intent on creating a perfect race of superhumans. At different times, the Marauders have been tasked with Sinister to perform kidnappings, assassinations, mass murder, or to simply fight Sinister's enemies. At different times, Marauders have been killed in combat, but often Mr. Sinister later uses his cloning technology to re-create them. This team of Marauders has appeared in many different stories of the X-Men franchise, as well as stories featuring other Marvel Comics heroes.

Mister Sinister is a supervillain appearing in American comic books published by Marvel Comics. Created by writer Chris Claremont, the character was first mentioned as the employer behind the team of assassins known as the Marauders in The Uncanny X-Men #212, and later seen in silhouette in The Uncanny X-Men #213, with both issues serving as chapters of the 1986 "Mutant Massacre" crossover. Mr. Sinister then made his first full appearance in The Uncanny X-Men #221. His appearance was designed by artist Marc Silvestri.