Atreus
Atreus may refer to:
- Atreus (FWL), the Free Worlds League planetary system
- Atreus (Clan System), the planetary system in the Kerensky Cluster
- Atreus (Individual WarShip), Free Worlds League WarShip
- Atreus (WarShip class), Star League-era battleship
- Atreus City, capital of the Free Worlds League
- Atreus Prime, the Taurian Concordat planetary system