Kirchberg is a mountain in Northampton County in Pennsylvania’s Lehigh Valley. Its main peak reaches 1,004 feet in Lower Saucon Township, east of Hellertown, and overlooks Saucon Gap to the west. Geologically, it belongs to the Reading Prong within the Appalachian Mountains. Rather than forming a large isolated summit, Kirchberg is significant as one of the local high points rising above the Saucon Valley.