Greyhawk Ruins is an adventure module for the Dungeons & Dragons (D&D) fantasy role-playing game.

Brown, with cover art by Fred Fields, and was published by TSR in 1990 as a 128-page book with an outer folder.

[1] The adventure portion was 86 pages with the remainder comprising monster lists and dungeon maps.

The module features interior art by Thomas Baxa, Mark Nelson and David Simons.

[2] In his 1991 book Heroic Worlds, Lawrence Schick calls the adventure "a classic illogical "gilded hole" dungeon".