The Union County Industrial Railroad (reporting mark UCIR) is a shortline railroad that operates on approximately 12 miles (20 km) of track in Union County in the U.S. State of Pennsylvania.

The line is along the right bank of the West Branch Susquehanna River, roughly following U.S. Route 15 between the unincorporated village of Winfield in southern Union County and the village of New Columbia (in White Deer Township) in northern Union County.

[1] Although the UCIR has no employees and owns none of the track on which it operates, its corporate offices are located in Northumberland, Pennsylvania.

The North Shore Railroad System has trackage rights via the Norfolk Southern line.

The UCIR formerly operated the West Shore Railroad (reporting mark WTSE) from Lewisburg to Mifflinburg, but service ended in 1997 and the 11.8 miles (19.0 km) line was sold to become a rail trail in 2008.