MMT may refer to:
Economics
- Modern Monetary Theory, a branch of economic theory
Geography
- 4QMMT (or MMT), one of the Dead Sea Scrolls
- Myanmar Time (UTC+06:30)
Mathematics
- MacMahon's master theorem, a result in enumerative combinatorics and linear algebra
Technology
- MMT (Eclipse), a software project
- Multimode manual transmission, in a motor vehicle
- MPEG media transport, a digital container standard
Science
- Methylcyclopentadienyl manganese tricarbonyl, an organomanganese compound
- MMT Observatory, an astronomical observatory in Arizona, USA
- MMt, one million metric tons
- Montmorillonite, a clay
Music
- Magical Mystery Tour, a record by the English rock band the Beatles
Television
- Miyagi Television Broadcasting, a Japanese commercial broadcaster
Transportation
- Marshalltown Municipal Transit, in Marshalltown, Iowa