Fallout 4 Factions

The following are the factions of Fallout 4.

Joinable
During the course of the game, there will be an option to side with one or more of them. 

Minor factions
The following are minor factions that can either be neutral, friendly or hostile towards the player character and each other.  

Add-on factions
These are the factions added to the game in Fallout 4 add-ons. 

Creature factions
These are the factions for different types of creatures, most are hostile to everyone.

Technical factions
These are factions which are used in the game for technical purposes and to enable complex functionality during quests and encounters.