N4
# 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

## 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

* N $_4,$ 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
* N4, TSMC's 4 nm semiconductor process node
