Unionville is the name of several places in the U.S. state of Pennsylvania:
Unionville, Beaver County, Pennsylvania, an unincorporated community and census designated place Unionville, Berks County, Pennsylvania Unionville, Butler County, Pennsylvania, an unincorporated community and census designated place Unionville, Centre County, Pennsylvania, a borough Unionville, Chester County, Pennsylvania, an unincorporated community and census designated place Unionville, Montgomery County, Pennsylvania Neffs, Pennsylvania in Lehigh County, historically called Unionville