MMT may refer to:

• Modern Monetary Theory, a branch of economic theory

• 4QMMT (or MMT), one of the Dead Sea Scrolls

• Myanmar Time (UTC+06:30)

• MacMahon Master theorem, a result in enumerative combinatorics and linear algebra

• MMT (Eclipse), a software project
• Multimode manual transmission, in a motor vehicle
• MPEG media transport, a digital container standard

• Methylcyclopentadienyl manganese tricarbonyl, an organomanganese compound
• MMT Observatory, an astronomical observatory in Arizona, USA
• MMt, one million metric tons
• Montmorillonite, a clay

• Magical Mystery Tour, a record by the English rock band the Beatles

• Miyagi Television Broadcasting, a Japanese commercial broadcaster

• Marshalltown Municipal Transit, in Marshalltown, Iowa