MSO

MSO may refer to:

Orchestras

 * Madison Symphony Orchestra, of Madison, Wisconsin, U.S.
 * Melbourne Symphony Orchestra, of Melbourne, Victoria, Australia
 * Melbourne Ska Orchestra, of Melbourne, Victoria, Australia
 * Milwaukee Symphony Orchestra, of Milwaukee, Wisconsin, U.S.
 * Monroe Symphony Orchestra, of Monroe, Louisiana, U.S.
 * Montreal Symphony Orchestra, of Montreal, Quebec, Canada

Businesses and organizations

 * Martha Stewart Living Omnimedia, a media and merchandising company
 * McLaren Special Operations of McLaren Automotive
 * Mind Sports Organisation, a vehicle for promoting mental-skill games
 * Mind Sports Olympiad

Science and technology

 * Methionine sulfoximine, a chemical compound
 * Multiple system operator, an operator of multiple cable or direct-broadcast satellite TV systems
 * Murashige and Skoog medium, a plant growth medium used in laboratories for cellular cultivation
 * Mixed-signal oscilloscope
 * Monadic second-order logic, in mathematical logic

Transportation

 * Michigan Southern Railroad (1989), reporting markm MSO
 * Missoula Montana Airport, in Montana, U.S., IATA code MSO
 * Moston railway station, in Manchester, England, station code MSO

Other uses

 * Maritime security operations, combatting sea–based terrorism and other illegal activities
 * Manufacturer Statement of Origin, or Manufacturer's Certificate of Origin
 * Mountain Skies Observatory, in Wyoming, U.S.
 * A US Navy hull classification symbol: Minesweeper, ocean (MSO)
 * Mars Science Orbiter, a proposed spacecraft
 * Municipal Services Office (Singapore), a government office