Union Deposit is an unincorporated community and census-designated place in South Hanover Township, Dauphin County, Pennsylvania, United States.

[1] Union Deposit (formerly called Unionville and Uniontown) was laid out in 1833 by Isaac Hershey (west end) and Philip Wolfersberger (east end).

[2] The village's original growth and namesake comes from construction of the Union Canal, which deposited goods in the area, upon where the village boomed from various commercial enterprises.

Its southern and eastern border follows Swatara Creek, a southward-flowing tributary of the Susquehanna River.

Pennsylvania Route 39 (Hershey Road) forms the northeastern edge of the community; it leads southeast 2 miles (3 km) to the center of Hershey and northwest 5 miles (8 km) to Interstate 81.