N56

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
 * HMS Grampus (N56), a Grampus-class submarine of the Royal Navy sunk in 1940
 * HMS Union (N56), a U-class submarine of the Royal Navy sunk in 1941