The Thieves' World boxed set is a role-playing game setting, featuring contributions from noted Thieves World novelists such as Poul Anderson and Robert Asprin.

The boxed set includes the following items:

• The Player's Guide to Sanctuary (two copies)
• The Game Master's Guide to Sanctuary
• Personalities of Sanctuary
• fold-out brown-and-white maps of Sanctuary, the Maze, and the Maze Underground

The boxed set is mostly a setting guide, but it also contains sections with statistics and rules for a wide number of different role-playing game systems popular at the time of publication:

• Advanced Dungeons & Dragons
• Adventures in Fantasy
• Chivalry & Sorcery
• DragonQuest
• The Fantasy Trip
• RuneQuest
• Traveller
• Tunnels & Trolls.