Cementon is an unincorporated area and census-designated place (CDP) in Lehigh County, Pennsylvania.

Pennsylvania Route 329 passes through the center of Cementon, crossing the Lehigh east into Northampton and leading west through Egypt to Neffs.

Pennsylvania Route 145 forms the western boundary of Cementon, crossing PA 329 in the Eagle Point neighborhood.

PA 145 leads northwest 8 miles (13 km) to Walnutport and south to the center of Allentown.

After a large Whitehall Portland Cement Works quarry and mill were established in 1900–01, the town was renamed "Cementon".