N23

N23 may refer to:

Roads

 * N23 road (Belgium)
 * Route nationale 23, in France
 * N23 road (Ireland)
 * Nebraska Highway 23, in the United States

Other uses

 * N23 (Long Island bus)
 * Escadrille N23, a squadron of the French Air Force
 * Nieuport 23, a French First World War fighter
 * Nitrogen-23, an isotope of nitrogen
 * Northrop N-23 Pioneer, an American transport aircraft
 * Sidney Municipal Airport (New York), in Delaware County, New York, United States