NTT

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
 * NTT Docomo, a mobile phone operator, subsidiary of NTT founded in 1991
 * Nottinghamshire, county in England, Chapman code
 * 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)
 * The New Traveller's Tales (NTT) engine, a game engine used for the 2022 video game Lego Star Wars: The Skywalker Saga