New Jersey Route 303

Route 303 was a proposed state highway in the U.S. state of New Jersey. It was first planned in 1938 as Route S4D (a spur of Route 4) starting in Fort Lee, passing through Teaneck, and continuing to the New York state line.

The road was never built, although in the 1953 renumbering, the number 303 was reserved for it, as it was planned to connect with New York State Route 303.