Long Bottom is an unincorporated community in southern Olive Township, Meigs County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 45743.
It lies on the Ohio River, located below Reedsville and above Portland.
Public education in the community of Long Bottom is provided by the Eastern Local School District. Campuses serving the community include Eastern Elementary School (Grades K-8) and Eastern High School  (Grades 9-12).
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Coordinates: 39°05′10″N 81°48′13″W / 39.08611°N 81.80361°W