MTI may refer to:
Government and military Mastering the Internet, a mass surveillance project led by the British intelligence agency GCHQ Military training instructor, the United States Air Force equivalent of a drill instructor
Technology Message Type Indicator, in ISO 8583 Moving target indication, a radar signal processing technique used to distinguish targets from clutter
Organizations Magyar Távirati Iroda, a Hungarian news wire agency Ministry of Trade and Industry (Singapore), a ministry of the Government of Singapore Mitchell Technical Institute, a community college in South Dakota, US Music Theatre International, a musical theater licensing company Midwest Technical Institute, a vocational school in Springfield, Illinois, US MTI Home Video, a film distributor
Other uses Master of Translation and Interpreting, a master's degree Mother tongue influence, a form of language interference Movie tie-in (book) edition of a book is often indicated by "(MTI)" after its title Muppet Treasure Island, a 1996 Muppet film