Chieftain
Chieftain may refer to:
- Chieftain (Individual Overlord-class DropShip), Wolf's Dragoons DropShip
- Chieftain (Individual Stefan Amaris-class WarShip), Star League Defense Force battleship
- Operation CHIEFTAIN, SLDF codename given to the retaking of the Terran Hegemony worlds during the Amaris Civil War