A Referee is the person that oversees and runs the Role-playing game experience.
- Traveller has very consistently called its gamemaster a referee over its many editions since 1977 CE. There has been a little variation.
The referee guides a set of players or player characters (PC's) through an adventure scenario, often having to improvise or make changes to an established product's setting and gameplay on the fly. They typically started with a published adventure or scenario as a game starting point and have to go from there, changing settings, creating new non-player characters (NPC's), and otherwise creatively writing the ongoing collaborative story that the referee and players create together.
- Dungeon Master (DM)
- Game Master (GM)
- Game Operations Director
- Hollyhock God
- Keeper of Arcane Lore
- Story Master