Marion is an unincorporated community and census-designated place (CDP) in Franklin County, Pennsylvania, United States. As of the 2020 census, the population was 851. It lies along U.S. Route 11, 6 mi south of Chambersburg and 5 mi north of Greencastle. Interstate 81 passes along the eastern edge of the community, with access from Exit 10 (Pennsylvania Route 914). I-81 leads northeastward 37 mi to Carlisle and south 17 mi to Hagerstown, Maryland. Marion was originally called Independence, and under the latter name was laid out circa 1810. A post office called Marion has been in operation since 1833. The present name is after Francis Marion, army officer during the American Revolutionary War, known as the Swamp Fox.

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