N57

N57 may refer to:

Roads

 * N57 motorway (Netherlands)
 * N57 road (Ireland), now the N26
 * Nebraska Highway 57, in the United States

Military

 * N-57/OKB-16-57, an experimental Soviet autocannon
 * Escadrille N57, a unit of the French Air Force
 * HMS Severn (N57), a submarine of the Royal Navy

Other uses

 * N57 (Long Island bus)
 * BMW N57, an automobile engine
 * New Garden Airport, in Toughkenamon, Pennsylvania, United States