N3 may refer to:
Roads N3 (Bangladesh), connecting Dhaka and Mymensingh N3 road (Belgium), one of the national roads in Belgium National Road 3 (Democratic Republic of the Congo) N3 road (Gabon) N3 road (Ghana) N3 road (Ireland), a National Primary Route N3 motorway (Netherlands), one of the national roads in the Netherlands N3 road (Oman) N3 road (Senegal), one of the national roads in Senegal N3 (South Africa), a road connecting Johannesburg to Durban Route nationale 3, France
Transportation , a Royal Navy battleship design that was never built , a 1915 coastal defense submarine of the US Navy SP&S Class N-3, a steam locomotives class from the Spokane, Portland and Seattle Locomotive Roster N3, gauges for monitoring a third section in a triple spool jet engine
N3, IATA code for the Russian airline Omskavia N3, European large goods vehicles above 12 tonnes N3 Pup - the Preceptor N3 Pup ultralight aircraft (and derivatives) Huanghai N3, a midsize pickup truck
Science and technology Haplogroup N (Y-DNA), a former human Y-chromosomal haplogroup, now N1c n-3, Omega-3 fatty acid Trinitrogen (), inorganic molecule composed of three nitrogen atoms , an azide anion in chemistry , a nitride anion in chemistry N3 Lung cancer, metastasis to certain lymph nodes N3, the genus three non orientable surface N3, cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium(II), a red dye in dye-sensitized solar cells N3, abbreviation for the 3 nanometer process node in semiconductor technology
Other N3 (Calgary), condominium building N3 (NHS), the national broadband network for the English National Health Service Notation3, or N3 rules, a textual notation for the Resource Description Framework N3, the third level of the Japanese-Language Proficiency Test N3, the most recent version of the Nagravision conditional access system for cable and satellite television N3, a postcode district in the N postcode area in London N3, the former name of NDR Fernsehen, a German television channel
See also N03, the ICD-10 code for Nephritic syndrome ATC code N03, Antiepileptics, a subgroup of the Anatomical Therapeutic Chemical Classification System 3N (disambiguation) List of highways numbered 3 N road (disambiguation)