MCS
- Christian studies
- List of mine warfare vessels of the United States Navy
- MCS (fashion brand)
- MCS algorithm
- Magdalen College School, Brackley
- Magdalen College School, Oxford
- Malahide Community School
- Malate Catholic School
- Management control system
- Manhattan Country School
- Marcus Corporation
- Marine Conservation Society
- Mars Climate Sounder
- Maryknoll Convent School
- Massive Cluster Survey
- Master of Computer Science
- Master of Computer Science
- Master's College and Seminary
- Mater Carmeli School
- Matrix cable system
- McMinn County Schools
- Megawatt Charging System
- Mellon College of Science
- Membrane contact site
- Mercalli-Cancani-Sieberg scale
- Mesoscale convective system
- Methodist Church in Singapore
- Michaela Community School
- Michigan Central Station
- Micro Computer Set (disambiguation)
- Military College of Signals
- Millennium Cohort Study (disambiguation)
- Milwaukee County Stadium
- Minimally conscious state
- Modulation and coding scheme
- Montrose Christian School
- Motion City Soundtrack
- Multi categories security
- Multinational Character Set
- Multiple chemical sensitivity
- Multiple cloning site
- Muncie Community Schools
- Murfreesboro City Schools
- Murree Christian School
- Music Construction Set
- Muslim Council of Scotland
- OS/360 and successors