New Castle Area Transit Authority is a public transportation service located in Lawrence County, Pennsylvania.

It provides inter-city bus and paratransit service to select communities within the county.

Connections can no longer be made to Youngstown's Western Reserve Transit Authority.

The western end point of the New Castle system is on Route 91, on U.S. 422 at the Country Manor Social Hall at the Ohio/Pennsylvania border [1], about 3 miles from the easternmost point in the WRTA system (Route 32 Wilson-Struthers, U.S. 422 at Struthers-Liberty Road).

[3] All routes[1] run Monday though Saturday and terminate at the Downtown New Castle transfer center, unless otherwise noted.