Greyspace (product code SJR6) is a supplement published by TSR in 1992 for the steampunk role-playing campaign setting Spelljammer, which uses the rules for Dungeons & Dragons.

Greyspace describes a part of the sphere of the Ptolemaic system that surrounds the planet Oerth of the Greyhawk setting.

[1] In 1989, TSR introduced a number of new RPG campaign settings, including Spelljammer, which added a note of steampunk science fiction to the fantasy Greyhawk setting.

TSR subsequently published several supplements and adventures for Spelljammer, including Greyspace in 1992, a 96-page softcover book written by Nigel Findley, with cover art by Tom Baxa, interior illustrations by David O. Miller, and cartography by John Knecht.

[1] Greyspace was a finalist for "Trophée du meilleur supplément, français ou étranger, publié en 1992 pour un jeu de rôle" ("Best Role-playing Supplement of 1992, French or foreign-language") awarded by the French RPG magazine Casus Belli.