Domain of Evil is an adventure supplement for Star Wars: The Roleplaying Game published by West End Games. It was written by Jim Bambra and published in 1991. It was republished in Classic Adventures: Volume Two.

It is perhaps most notable for introducing Halagad Ventor.

Front page: There is something not right on the swamp planet Trinta. It is an evil place of cold and death, and only the bravest, most capable Rebels will survive its terrors.

Back page: Stranded on the swamp world of Trinta and pursued by relentless bounty hunters, a group of Rebels face horrors drawn from their own minds - horrors with the power to destroy them! Pitted against the powers of an insane Jedi Knight and the Dark Nexus in which he dwells, the rebels must triumph or risk falling to the dark side of the Force.