Faction or factionalism can refer to:
- Political faction, a group of people connected by a shared belief or opinion within a larger group
- Faction (literature), a type of historical novel rooted in fact
- Faction (Planescape), political factions in the game, Planescape
- Guild Wars: Factions, a computer game developed by ArenaNet.
- FACTION 28, a music channel on SIRIUS Satellite Radio
- Faction (musical project), a British/Israeli electronic music project
- The Faction, a Punk rock band
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