Douglas G. Greene is an American editor and writer who has made a significant contribution to the scholarship on L. Frank Baum and Oz. Most notably, he collaborated with Peter E. Hanff on the Bibliographia Oziana (1976, 1988, 2002), the primary bibliographic resource on the Oz literature. He also collaborated with Michael Patrick Hearn on a 1976 biography of W. W. Denslow. Among his minor works, Greene's essay "W. W. Denslow, Illustrator" appeared in The Journal of Popular Culture, Vol. 7 No. 1.
Beyond the confines of Baum and Oz, Greene is a noted authority on mystery fiction. As author or editor, his eighteen books include:
- Death Locked In: An Anthology of Locked Room Stories (1987)
- John Dickson Carr: The Man Who Explained Miracles (1995)
- Detection by Gaslight: 14 Victorian Detective Stories (1997)
- Classic Mystery Stories (2000)
Greene has also run his own small press, Crippen & Landru, devoted to the mystery genre. He is a professor of history at Old Dominion University in Virginia.
(Douglas G. Greene should not be confused with his identical twin David L. Greene, author of The Oz Scrapbook and other works. Greene and Greene collaborated on an Introduction to the 1973 Hyperion edition of Baum's The Master Key.)