The Grey Knight is a Arthurian tabletop role-playing adventure, written by Larry DiTillio with art by Susan Seddon Boulet, and published by Chaosium in 1986.

The adventurers, who are all Knights of the Round Table, are sent on a quest to find a special whetstone, one of the Thirteen Treasures of Britain, which will be the key to Gawaine's victory.

"[1] In the September 1987 edition of Dragon (Issue #125), Ken Rolston gave this adventure high marks, calling it "A solid winner, best-in-show.

The author, Larry DiTillio, is a master narrative technician, and he’s working with the rich resources of the Arthurian legend and the unique Pendragon game system, designed by Greg Stafford to support moral dilemmas and tests of character as well as hack-and-slash combat and fireball barbecues."

"[3] Stewart Wieck reviewed The Grey Knight in White Wolf #7 (1987), rating it a 10 out of 10 and stated that "A truly marvelous adventure by Larry DiTillio that utilizes the Pendragon system to its fullest.