Lord John William Grey is a fictional character created by Diana Gabaldon. He is a recurring secondary character in Gabaldon's Outlander series of novels, and the main character of the Lord John series of historical mystery novels and novellas. Secretly homosexual "in a time when that particular predilection could get one hanged", the character has been called "one of the most complex and interesting" of the hundreds of characters in Gabaldon's Outlander novels.