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 (East McFarland Street) 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 and North Jersey Transportation Planning Authority have considered more bypasses and alignment changes for Route 15.
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