This article or section contains lore taken from Warcraft III: Reign of Chaos, Warcraft III: The Frozen Throne, the manuals, and official bonus maps.

The Mages' Union (or Mages' Guild^{[citation needed]}) was one of three factions within Dalaran, including the Kirin Tor and Sorcerer's League, which tried to hold back the forces of the Scourge during Arthas' siege of the city during the Third War.