- Ministry For State Security (''Ministerium für Staatssicherheit''), the security and intelligence organisation of the German Democratic Republic, commonly known as ''Stasi''
- Metropolitan Fire Service , South Australia's government-funded fire service
- Master Of Forensic Sciences , a specialized professional degree
- Miletich Fighting Systems , a mixed martial arts training camp founded by Pat Miletich
- Maryknoll Fathers' School , a government-funded co-ed in Hong Kong SAR, P.R.C.
- Moorestown Friends School , a private Quaker school located in Moorestown, New Jersey, USA
- Metropolitan Fiber Systems , a telecommunications service provider acquired by Worldcom in 1997
- Maximum flooding surface, a term used in Sequence Stratigraphy
- MFS Investment Management formerly Massachusetts Financial Services.
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