Shadowbane is a free fantasy computer role-playing game (MMORPG) created by Wolfpack Studios and published on March 25, 2003 by Ubisoft for Windows and Mac platforms. Originally commercial and subscription-driven, Shadowbane was launched in March 2003, and was the creation of text-MUD veterans J. Todd Coleman, James Nance, Josef Hall, Patrick Blanton and Robert Marsa and a team of 45 programmers, designers and artists.

Shadowbane was a top-10 best selling PC game at launch, and was noted for two things. First, the majority of the game world allowed for open Player-vs-Player combat, making it an early pioneer title in the PvP MMO genre. Second, it was the first major MMO to offer dynamic world content as a primary feature of the game. Most MMOs (such as Everquest) are static, meaning the world itself does not change based on player actions. Dynamic worlds allow player to change the game world itself; morphing terrain, building and destroying buildings and fortifications, and setting up patrol paths for player-hired AI combatants. The game was considered a "cult hit" and continues to sustain a small base of followers, but technical issues plagued the game at launch and failed to retain much of the early fanbase shortly after launch.

After the sale of Wolfpack Studios to Ubi Soft in March 2004, the live service was transitioned to a new management and (largely new) development team, led by Frank Lucero and Ala Diaz. This team later splintered off to become Stray Bullet Games in June 2006, and Mark Nuasha was brought in to run the organization. Since March 15, 2006 the game has been freeware and free-to-play. A system of short ads was introduced on March 6, 2007 to fund operating costs, which are displayed when the game is opened or closed and when a character dies (with at least 10 minutes between death ads)

The regular game takes place in a dark fantasy world called Aerynth (the world will sometimes depend on the servers, many of which have unique world maps). Gameplay features many aspects typical of computer role-playing games, such as experience points, character classes, and fantasy races. Character creation is fairly extensive, allowing for detailed, differentiable characters to be created.