N56 may refer to: Roads N56 road (Belgium) Route nationale 56, in France N56 road (Ireland) N56 highway (Philippines) Nebraska Highway 56, in the United States
Other uses N-56 (pressure group) a Scottish pressure group Great Valley Airport, in Cattaraugus County, New York, United States , a Grampus-class submarine of the Royal Navy sunk in 1940 , a U-class submarine of the Royal Navy sunk in 1941