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 , 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