MTI may stand for:
- MTI, Message Type Indicator
- MTI Consultancy, Machwuerth Team International (MTI) Group, a consultancy based in Germany
- MTI Consulting, a consulting firm based in Bahrain
- MTI Technology Corporation, a technology company
- Magyar Távirati Iroda, a Hungarian news wire agency
- Marine Technology Inc., a boat manufacturer that crafted the offshore catamaran used by the character Sonny Crockett in the Miami Vice film
- Master of Translation and Interpreting, a master's degree of translation and interpreting awarded by a university or higher education institute
- Military Training Instructor, the United States Air Force equivalent of a Drill Instructor
- Ministry of Trade and Industry (Singapore), a ministry of the Government of Singapore
- Mitchell Technical Institute, a South Dakota community college
- Mother Tongue Influence, the habit of native speakers of one language to modify non-native languages with phonetics and vocabulary of their native tongue
- Movie tie-in (book) edition of a book is often indicated by "(MTI)" after its title
- Moving target indication, a radar signal processing technique used to distinguish targets from clutter
- Muppet Treasure Island, 1996 Muppet film
- Music Theatre International, a musical theater licensing company