Faction or factionalism may refer to:
Political faction, a group of people with a common political purpose
The Faction, an American punk rock band
Faction (Planescape), a political faction in the game Planescape
Faction (literature), a type of historical novel based on fact
Factions (Divergent)
The Faction, an Atlanta United supporters' group
Faction fighting, an English term for Irish mass stick fights, see Bataireacht
