Organizations
- Machine and Tractor Station, a state enterprise of agricultural machinery in the Soviet Union and Bulgaria
- Manitoba Teachers' Society, 1919-present, a Manitoba, Canada teacher union
- Marine Technology Society, a society of marine engineers, technologists, policy makers and educators
- Metro Transport Sydney, 1997-present, a light rail and monorail operator in Sydney, Australia
- Millennium Transit Services, 2003-2009, a United States bus builder
- MTS Systems Corporation, 1966-present, a testing and sensing solutions company
- Metropolitan Transit System, 1886-present, a public transit operator in San Diego
- Manitoba Telecom Services, a Manitoba, Canada land-line and wireless provider
- Mobile Telephony of Serbia, a subsidiary of Telekom Srbija
- Mobile TeleSystems, a Russian mobile phone provider
- MTS Ukraine, a Ukrainian service provider
- MTS India, an Indian service provider
- Merchant Taylors' School (disambiguation), several
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