The Thieves Guild is an organized group of thieves based in Skyrim that provides mutual support for the criminal endeavors of its members.

Little is known about when and how the Thieves Guild was founded, but it is rumored to have been around as long as Riften has. As the Fourth Era continued, the Thieves Guild slipped further and further into obscurity and the members and regular clients began to leave (with the exception of Maven Black-Briar). The guild was previously believed to be completely fictional; in Oblivion, if asked about the guild, guards would simply state that there was no such thing. However, the Thieves Guild has become well known and, in fact, well renowned for their thievery.

The guild has some close association with the Dark Brotherhood which becomes apparent in The Silence Has Been Broken, where the player must bring an amulet given by Amaund Motierre to Delvin Mallory, a member of the Thieves Guild.