List of Pennsylvania state historical markers in Union County

This is a list of the Pennsylvania state historical markers in Union County.

This is intended to be a complete list of the official state historical markers placed in Union County, Pennsylvania by the Pennsylvania Historical and Museum Commission (PHMC). The locations of the historical markers, as well as the latitude and longitude coordinates as provided by the PHMC's database, are included below when available. There are 22 historical markers located in Union County.