MS, ms, Ms, or mS is a common abbreviation that can mean a large number of things.

ms may stand for:

• millisecond, an SI unit of time
• The Iso 639-1 language code for Malay

mS may stand for:

• millisiemens, an SI unit of conductance

• Ms., a female title
• Ms. magazine
• In seismology, the surface wave magnitude, a measurement of an earthquake

MS may refer to:

• MS is the stock ticker for Wall Street firm Morgan Stanley
• One of the following standardised ID codes:
  • The Iso 3166-1 country code for Montserrat
  • The IATA airline designator for EgyptAir
  • A ship prefix (nautical vessel designation) for a motor ship used in most countries
  • In the United States:
    • The postal abbreviation for the U.S. state of Mississippi
    • The AAR reporting mark for the Michigan Shore Railroad

MS may stand for:

In arts:

• A manuscript (plural: MSS)
• M.S. Subbulakshmi, the Indian carnatic singer

In education:

• Master of Science
• Master of Surgery
• Middle school

In medicine:

• Multiple sclerosis
• Mitral stenosis

In science:

• Mean square (or mean of the squares of a set of data)
• Mass spectrometry or a mass spectrometer
• Murashige and Skoog medium

In computing:

• Microsoft, the US software company
• MySpace, a blogging website

In computer gaming:

• Macrosutra, a software company and package
• Magestorm, a first-person shooter game
• Sega Master System, an 8-bit video game system
• Minesweeper (computer game), a two-dimensional puzzle game
• MapleStory, a Korean-produced 2-D side-scrolling MMORPG
• Metal Sonic, the robotic counterpart of Sonic the Hedgehog
• Metal Slug, a run and gun video game for the Neo-Geo console/arcade platform created by SNK
• Mother ship

In other uses:

• Mara Salvatrucha, a Central American street gang
• Military science, the study of the technical, psychological, practical and other phenomena which constitute warfare and armed conflict
• Member state, in EU politics
• Memory Stick, a removable flash memory card format, launched by Sony
• Mobile suit, technological machinery from the Gundam anime universe
• Mild Seven, a cigarette brand

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