Loop was an unincorporated community in West Mahoning Township, Indiana County, Pennsylvania. It was named for being near a loop-like meander of Mahoning Creek. Lysander Barrett settled in the area around 1842; an iron furnace was erected in 1847. Before its eventual abandonment, the community had a post office (from 1885 to 1959), a schoolhouse, and a stop on the Buffalo, Rochester and Pittsburgh Railway.

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40°53′59″N 79°09′56″W/40.89972°N 79.16556°W/ 40.89972; -79.16556