Lafayette Township is a township located in the Skylands Region of Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 2,358, a decrease of 180 (−7.1%) from the 2010 census count of 2,538, which in turn reflected an increase of 238 (+10.3%) from the 2,300 counted in the 2000 census. The township is crossed by Route 15 and Route 94.

Route 15 is a state highway in New Jersey, spanning Morris and Sussex counties, which travels for 19 miles (31 km) from U.S. Route 46 in Dover to an intersection with U.S. Route 206 in Frankford Township. It becomes a divided highway in Wharton Borough until becoming a freeway bypass near Sparta. Route 15 was originally Route 6A from 1927 until 1953, when a renumbering occurred and the route was given its current number. Since the finishing of the Sparta Bypass, the New Jersey Department of Transportation (NJDOT) and North Jersey Transportation Planning Authority have considered more bypasses and alignment changes for Route 15.