Douglas Harper (born 1960) is a historian, author, and journalist based in Lancaster, Pennsylvania, United States.  He is the author of historical books on Civil War-era Chester County, Pennsylvania. He is the founder of the Online Etymology Dictionary.
Harper has written the following books and articles:
- If Thee Must Fight: A Civil War History of Chester County, Pa. (Chester County Historical Society, 1990)
- An Index of Civil War Soldiers and Sailors from Chester County, Pa. (Chester County Historical Society, 1995)
- The Whitman Incident: Revolutionary Revisions to an Ephrata Tale, Lancaster County Historical Society Journal, 1995
- West Chester to 1865: That Elegant & Notorious Place (Chester County Historical Society, 1999)
- "About the Author". Online Etymology Dictionary. Retrieved 26 Sep 2012.
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