New Alexandria is a borough that is located in Westmoreland County, Pennsylvania, United States.

Settled in 1760 along the banks of the Historic Loyalhanna Creek, this community began as a wagon rest stop for travelers, soldiers and militiamen during the American Revolution.

New Alexandria is located at 40°23′50″N 79°25′25″W / 40.39722°N 79.42361°W / 40.39722; -79.42361 (40.397254, -79.423591),[3] along U.S. Route 22 approximately midway between Pittsburgh and Johnstown.

According to the United States Census Bureau, the borough has a total area of 0.8 square miles (2.1 km2), all land.

At the time of the 2000 census, there were 595 people, 254 households, and 186 families living in the borough.