NN

NN, Nn, or nn may refer to:

Economy

• Nationale-Nederlanden, Dutch insurance company commonly referred to as NN

Geography

• Nizhniy Novgorod, a Russian city/major trading center
• NN postcode area, for areas of Northamptonshire, England
• NN as abbreviation for Normalnull, a metric German height reference system preceding Normalhöhennull (NHN)

Science and technology

• nearest neighbor
• Net neutrality
• Neural network
• nn (newsreader), a Unix-based news client
• Logo of Norilsk Nickel, а metallurgical and mining company

Transport

• Nevada Northern Railway reporting mark
• VIM Airlines (IATA airline designator)

Other

• N. N., for Latin Nomen nescio or, equivalently, No Name, a person whose name is unknown
• N.N., a pseudonym of 18th-century Italian priest Camillo Almici
• N.N., a Colombian television series
• NN (film), a 2014 Peruvian film
• Netroots Nation, a political convention for American progressive activists
• Nynorsk, a Norwegian written language (ISO 639 alpha-1, nn)
• Double net lease, a type of lease used for commercial real estate
• Ñ, originally derived from a written nn.