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 Route nationale 4 (Niger)
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 N4 (film), Indian Tamil films of 2023
See also 4N (disambiguation) N04 may refer to: ATC code N04 Anti-parkinson drugs, a subgroup of the Anatomical Therapeutic Chemical Classification System Griswold Airport FAA LID Nephrotic syndrome ICD-10 code N°4, a shortening for Number Four (disambiguation)