N3

N3 may refer to:

Roads

N3-class battleship, a Royal Navy battleship design that was never built
SP&S Class N-3, a steam locomotives class from the Spokane, Portland and Seattle Locomotive Roster
USS N-3 (SS-55), a 1915 coastal defense submarine of the US Navy
N3, European large goods vehicles above 12 tonnes
N3, IATA code for the Russian airline Omskavia
N₃ (jet engines), the RPM for a third section in a jet engine

Haplogroup N (Y-DNA), a former human Y-chromosomal haplogroup, now N1c
n-3, Omega-3 fatty acid
N₃⁻, an azide anion in chemistry
N3 (cis-bis(iso-thiocyanato) bis(2,2¢-bipyridyl-4,4¢-di-carboxylato) ruthenium(II) ), a red dye using in dye-sensitized solar cells
N3 Lung cancer, metastasis to certain lymph nodes
N3, the most recent version of the Nagravision conditional access system for cable and satellite television
N3 (NHS), the broadband network for the NHS in England
N3, a postcode district in the N postcode area
Ninety-Nine Nights, a video game for the Xbox 360
Notation3, or N3 rules, a textual notation for the Resource Description Framework (RDF)
N₃ the genus three non orientable surface
N3 plugs are used for remote shutters on their high-end Canon DSLRs.
N3, a term used in online gaming which means "no name noob"
A model number of the Yamaha AvantGrand piano
N3, the third level of the Japanese Language Proficiency Test