Reaver can refer to:
- Border Reivers, aka Border Reavers, were raiders along the Anglo-Scottish border between the 12th and 16th centuries.
- Reaver (Firefly), space-faring cannibals in the television series Firefly and the related movie Serenity.
- Reavers (comics), cyborg villains in Marvel Comics.
- A mechanical unit in Starcraft
- Reavers (Fallout Tactics), a cult dedicated to technology worship in the computer game Fallout Tactics: Brotherhood of Steel.
