Fiend may refer to various demons:
- Icefiend, found in colder areas.
- Pyrefiend, Slayer monsters that require 30 Slayer to be harmed.
- Pyrelord, a stronger variant of pyrefiends.
- Flaming pyrelord, the superior variant of pyrefiends.
- Infernal pyrelord, the superior variant of pyrelords.
- Waterfiend, which reside in the Ancient Cavern and Kraken Cove.