Trion Worlds was an American video game developer. It focuses primarily on MMOs, particularly of the MMORPG and MMORTS genres. The company was founded in 2006 by Lars Buttler and Jon Van Caneghem, who had each previously worked for NCSoft and left in 2009 to join Electronic Arts.

Rift is a fantasy free-to-play massively multiplayer online role-playing game developed by Trion Worlds. Rift takes place within the fantasy world of Telara. Two competing factions, composed of a selection of races and classes, battle each other and the enemies who emerge from dynamic "rifts". The game was released in March 2011. A port of the game, called Rift Mobile, was released for Android on January 25, 2012.