MMS may stand for:
In science and technology:
- Multimedia Messaging Service, a standard for telephone messaging systems
- The Magnetospheric Multiscale Mission, a four-satellite NASA mission
- Manufacturing Message Specification, a networking standard
- Massachusetts Medical Society (MMS), publisher of the New England Journal of Medicine
- Master of Medical Science, a graduate degree in medical research
- Mesoporous Molecular Sieve, a porous material used in catalysis
- Methodology Management System, a technology that facilitates the modeling, deployment and improvement of business processes
- Methyl methanesulfonate, an alkylating agent with dna-damaging effects
- Microsoft Media Server, a data transfer protocol (mms://)
- Moment magnitude scale, used by seismologists to compare the energy released by earthquakes
- Module Management System, the make tool of OpenVMS
- Multi Mission System/THOR, a British Army vehicle mounted Starstreak missile launcher
In education:
- Miller Middle School, a middle school in San Jose, California
- Maillard Middle School, a school in Coquitlam, BC
- Minnekhada Middle School, a school in Port Coquitlam, BC
- Mansfield Middle School, a school in Mansfield, Connecticut
- Marshall Middle School (disambiguation)
- Mason Middle School, a school in Tacoma, Washington
- Maitland Middle School, a school in Maitland, Florida
- Memorial Middle School (Houston, Texas)
- Marlboro Middle School, a school in Marlboro, New Jersey
- Mineola Middle School (New York), a school in Mineola, NY
- Monhagen Middle School, a school near Middletown, New York
- Montgomery Middle School, a school in San Diego, California
- Modern Montessori School, a school in Amman, Jordan
- Murchison Middle School (Austin, Texas)
- Murdock Middle School, a school in Port Charlotte, Florida
- Margmiðlunarskólinn, the MultiMedia School, Reykjavik, Iceland
- Masters in Management Studies, a degree similar to an MBA
Other:
- Mandatory minimum sentencing, mandated minimum lengths of time that the Judiciary system must abide by
- Minerals Management Service, a U.S. Interior Department agency now known as the Bureau of Ocean Energy Management, Regulation and Enforcement
- Movimento Mérito e Sociedade (Merit and Society Movement), a minor political party in Portugal
- Mukti Morcha Samuha, an underground communist group in Nepal
- M&M's
- Manhattan Mini Storage
- Machinist's Mate S, a rank of the U.S. Navy
- Miracle Mineral Supplement
- WMMS, a commercial radio station in Cleveland, Ohio
- M.M.S. (Mobile Missile System), a G.I. Joe vehicle accessory