MTN may refer to:
- Mobile Telephone Number, an abbreviation used by Verizon Wireless
- MTN Group, a major South Africa-based mobile telephone network operator active in many African and Middle Eastern countries
- Maritime Telecommunications Network, a mobile phone network that operates on sea vessels like cruise liners
- An abbreviation for the country Mauritania
- An abbreviation for the word Mountain
- Martin State Airport, an airport in Baltimore
- "Marry the Night", a song by Lady Gaga from her album, Born This Way
- Manitoba Television Network, the former brand name of CHMI-TV, which is now known as Citytv Winnipeg
- MTN (TV station), a television station in Griffith, New South Wales, branded as WIN Television
- Medium term note, a debt note
- Michigan Talk Network, a 24-hour talk radio network serving Michigan radio affiliates
- Mizlou Television Network, an early syndicator of television sports in the United States
- An abbreviation for mountain
- Metriol trinitrate, a liquid explosive similar to nitroglycerin
- MTN, the Monotone software system for revision control
- Montana Television Network, a network of CBS affiliates in Montana
- The ICAO airline designator for Mountain Air Cargo
- MountainWest Sports Network, a sports network dedicated to the Mountain West Conference
- Multilateral trade negotiations, GATT and World Trade Organization talks.