Cults of Terror is a tabletop role-playing game supplement for RuneQuest, originally published by Chaosium in 1981.

The sourcebook details nine evil deities and the cults that worship them,[1] for use in Greg Stafford's fantasy world of Glorantha.

[4] Shannon Appelcline explained that "Though some of RuneQuest's first supplements were simple dungeon crawls and stat books, many others were groundbreaking.

[1] Pehr commented that "if you play RuneQuest, or even if you just want to see what an excellent game aid can be, you'll buy Cults of Terror.

"[1] Oliver Dickinson reviewed Cults of Terror for White Dwarf #34, giving it an overall rating of 6 out of 10, and stated that "For GMs who set their campaigns in Glorantha and use the RuneQuest religious structures and cosmology, and for all those who wish to know more of this fascinating world, this book is essential reading.