Riegelsville is an unincorporated community located in Pohatcong Township of Warren County, New Jersey. It is connected to Riegelsville, Pennsylvania across the Delaware River by the Riegelsville Bridge. The community is by the confluence of the Musconetcong River with the Delaware River. The Riegelsville Company Town Historic District encompassing the community was listed in the New Jersey Register of Historic Places in 1998.