Lemoyne is a borough in Cumberland County, Pennsylvania, United States. Lemoyne was incorporated as a borough on May 23, 1905. As of the 2010 census, the borough population was 4,553. It was formerly named "Bridgeport". Lemoyne lies across the Susquehanna River from Harrisburg, Pennsylvania's capital. It is part of the Harrisburg–Carlisle metropolitan statistical area.
Lemoyne is served by Interstate 83 and U.S. Routes 11/15. Lemoyne is served by the West Shore School District.
Lemoyne is located on the eastern edge of Cumberland County at 40°14′39″N 76°53′56″W (40.244217, -76.899119), on the west bank of the Susquehanna River, directly across from Harrisburg. It is bordered to the north by Wormleysburg, to the west by Camp Hill, and to the south by the borough of New Cumberland and Lower Allen Township.