New Wilmington is a borough in northern Lawrence County, Pennsylvania, United States, first platted in 1824 and established as a borough on April 9, 1863. The population was 2,097 at the 2020 census. It is home to Westminster College and serves the Old Order Amish community in the surrounding Wilmington Township. It is part of the Pittsburgh metropolitan area.

Lawrence County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 86,070. The county seat and largest city is New Castle.