NTA may refer to: Nanoparticle Tracking Analysis, a method for visualizing and analyzing particles National Tax Agency, the official tax collecting agency of Japan National Tax Association, a non-profit organization in United States National Telefilm Associates, was an independent film distribution company National Television Awards, a British awards ceremony National Testing Agency, government agency which conducts entrance examinations for higher educational institutions in India National Transport Authority (Ireland), the public transport licensing agency for Ireland National Treasury Administration, the agency of the Ministry of Finance in Taiwan National Treatment Agency for Substance Misuse, was a special health authority in England Native Title Act 1993, Australian federal legislation Natural Science and Technical Academy Isny, a private German university Neighborhood Tabulation Area, a geographical unit used for projecting demographics of New York City Nepal Telecommunications Authority New Transatlantic Agenda, establishment of relations between the US and EU, agreed to in 1995. Newark Teachers Association, a trade union in California, United States Newton Abbot railway station, Devon, England Nigerian Television Authority, a government-owned broadcasting television network in Nigeria Nitrilotriacetic acid, an aminopolycarboxylic acid Northern Territory Administration, an Australian Government department prior to self-government NTA Film Network, a former American television network Nuclei Territoriali Antimperialisti, an Italian terrorist group