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Proteus is a 2013 exploration and walking simulator video game designed and created by Ed Key and David Kanaga for Microsoft Windows, OS X, Linux, PlayStation 3 and PlayStation Vita. In the game, the player traverses a procedurally generated environment without prescribed goals. The world's flora and fauna emit unique musical signatures, combinations of which cause dynamic shifts in audio based on the player's surroundings.

The game began development in 2008. Key first conceived Proteus as an open-ended role-playing game akin to The Elder Scrolls IV: Oblivion but, because of the work required for such a project, later redesigned it to be "nontraditional and nonviolent". Audio designer and composer David Kanaga joined the project in 2010. Versions for the PlayStation 3 video game console and Vita handheld console were developed by Curve Studios, whose team added new gameplay features to the Vita edition at Sony's request.

Proteus won the prize for Best Audio at the 2011 IndieCade awards, and was a finalist for the 2012 Independent Games Festival's Nuovo Award. Following its release, critics praised the game, especially for its audio features, although some criticised the game's brevity and limited replayability. The game was frequently mentioned in discussions of video games as art, with some debating whether it could be considered a video game at all.