Tn or TN may refer to:
Businesses and organizations Air Tahiti Nui (IATA airline designation "TN" since 1998), a French Polynesian airline Texas and Northern Railway, an American railway (reporting mark "TN") , an Argentine cable news network Trans Australia Airlines (IATA airline designation "TN" until 1994), a defunct Australian airline , a public transport operator in Neuchâtel, Switzerland
Places Tamil Nadu, a state in southern India (ISO abbreviation "IN-TN") Tennessee, US (postal abbreviation "TN") Tonbridge, a region in England (postcode "TN") Tunisia (ISO 3166-1 country code "TN") Trentino, a province in Italy (ISO abbreviation "IT-TN") North Tipperary, a former county of Ireland (car plate code "TN")
Science and technology .tn, the country code top level domain (ccTLD) for Tunisia TN network, a type of earthing system for protection in electricity network Neel Temperature, the temperature at which an antiferromagnetic material becomes paramagnetic (represented as TN) Tetraodon, a genus of pufferfish Trigeminal neuralgia, a neuropathic disorder Transposon (when immediately followed by a number), a DNA sequence that can change positions Twisted nematic field effect, the technology that made LCD displays practical Thoron, symbol Tn, a sometimes used name for the nuclide radon-220
Other uses TN status ("Treaty national", or "Trade NAFTA"), an immigration status of a Canadian or Mexican citizen working in the USA under the NAFTA agreement Telephone number, in the telecommunications industry Tom Next (or Tomorrow Next), a financial trade which starts tomorrow and settles in the next trading day Trillion ("TN" or "tn"), a number equal to 1012 (short scale) or 1018 (long scale) Truck nuts, a vehicular novelty accessory resembling a dangling scrotum Tswana language (ISO 639-1 language code) Translators Note ("TN" or "t/n") , an Italian ship prefix, indicating that the ship was propelled by a turbine engine. Tobu's Nikko Line, Utsunomiya Line, and Kinugawa Line (railway line prefix TN)