N4

N4, N-4, or N.4 may refer to:

Computing

 * N4 (NHS), the successor to the N3 NHS computer network
 * NASCAR Racing 4, a NASCAR sim by Papyrus and Sierra
 * N4, a Markup Language
 * N4, TSMC's 4 nm semiconductor process node

Energy

 * N4 (nuclear reactor), a French pressurized water reactor type

Roads

 * N4 highway (Philippines)
 * N4 (Bangladesh)
 * N4 road (Belgium), a road connecting Brussels and Arlon
 * N4 road (France)
 * N4 road (Gabon)
 * N4 road (Ireland), a National Primary Route connecting Dublin, Mullingar, Longford, Carrick-on-Shannon, and Sligo
 * N4 road (Luxembourg)
 * N4 road (Senegal)
 * N4 road (South Africa), a road connecting the Botswana border, Pretoria, and the Mozambique border
 * N4 road (Spain), a National Primary Route connecting Madrid and Andalusia
 * N4 road (Switzerland)
 * Nebraska Highway 4, a state highway in the U.S. state of Nebraska

Transport

 * Fairey N.4, a British reconnaissance flying boat of the 1920s
 * LNER Class N4, a British steam locomotive class
 * Minerva Airlines, IATA airline designator
 * SP&S Class N-4, a steam locomotive class
 * USS N-4 (SS-56), a 1916 N-class coastal defense submarine of the United States Navy

Other

 * , an unstable molecule of nitrogen (tetranitrogen)
 * N4, a postcode district in the N postcode area of London
 * N4, a Drum & Bass / Hardcore record label run by Pete Cannon. Named after the N4 London postcode district
 * N4 (television channel), a community television channel in Akureyri, Iceland
 * Washburn N4, an electric guitar
 * The second level in the Japanese Language Proficiency Test
 * Nexus 4, an Android smartphone