NTT may refer to: National Native Title Tribunal (NTT), Australian government instrumentality NATO countries, as per NATO country code New Technology Telescope, a 3.6m telescope at La Silla Observatory, Chile New Technology Train, a series of the New York City Subway made from 1999 onwards New trade theory, an economic theory Niuatoputapu Airport, IATA code Nippon Telegraph and Telephone (NTT), a Japanese telecommunications company Nottinghamshire, county in England, Chapman code NTT Docomo, a mobile phone operator, subsidiary of NTT founded in 1991 NTT Ltd., a global technology and services provider, subsidiary of NTT founded in 2019 Number theoretic transform, a mathematical transform East Nusa Tenggara, a province of Indonesia known as Nusa Tenggara Timur in Indonesian language. non-traditional tincture (heraldry)