| Hollow World Campaign Set | |
| Genre: | Role-playing game |
| Publisher: | TSR, Inc. |
| Release Date: | 1990 |
| Media Type: | Boxed set |
The Hollow World Campaign Set is an accessory for the Dungeons & Dragons fantasy role-playing game.
Hollow World is a campaign setting boxed set detailing the enormous hollow inside of the planet of Mystara, and the people and creatures that inhabit the lands found there.
Hollow World was written by Aaron Allston, with a cover by Fred Fields and interior illustrations by Thomas Baxa and Mark Nelson, and was published by TSR in 1990 as a boxed set containing a 128-page book, a 64-page book, and a 32-page book, and four large color maps.[1]