Whitmer is a census-designated place (CDP) in Randolph County, West Virginia, United States. It is south-southwest of Harman and is situated on the Dry Fork Cheat River. Whitmer had a post office, which closed on May 21, 2011. As of the 2020 census, its population was 94 (down from 106 at the 2010 census).
Whitmer was incorporated in 1903.