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