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RSO or R.S.O. may refer to:

Roles and titles
  • Range Safety Officer, a person responsible for the safe use of rocket vehicles
  • Radiation Safety Officer, a person responsible for the safe use of radiation and radioactive materials
  • Regional Security Officer, a U.S. Diplomatic Security Service (DSS) Special Agent in charge of security at a U.S. Embassy
  • Regional Security Office, office from which Special Agents of the U.S. Diplomatic Security Service work - located at U.S. Embassies or Consulates overseas
  • Knight of the Order of the Sword (Swedish: )
  • "Radio Symphony Orchestra", used by a number of orchestras:
    • Danish National Symphony Orchestra, based in Copenhagen, Denmark
    • North German Radio Symphony Orchestra, based in Hamburg, Germany
    • Stuttgart Radio Symphony Orchestra, based in Stuttgart, Germany
    • Bavarian Radio Symphony Orchestra, based in Munich, Germany
    • Frankfurt Radio Symphony Orchestra, based in Frankfurt, Germany
    • Finnish Radio Symphony Orchestra
    • Swedish Radio Symphony Orchestra
    • Vienna Radio Symphony Orchestra
  • Rogers Sportsnet Ontario, a television station in Ontario, Canada
  • RSO Records, a record label formed by Robert Stigwood in the late 1960s
  • Rohingya Solidarity Organisation, a political organization of Burma (Myanmar) struggling for the basic human rights for the people of the Arakan State, especially Rohingya Muslims
  • Riverside Sheriff's Office, law enforcement provider for much of Riverside County, CA.
  • Reconnaissance Systems Officer, military personal in charge of optic equipment and radar-scrambling equipment in a spy plane
Military technology
  • Raupenschlepper Ost, a fully tracked WW II German artillery tractor
  • Radschlepper Ost (Škoda RSO), wheeled WW II German artillery tractor
  • Reactive Search Optimization, problem-solving methods with integrated online machine-learning capabilities
  • Revised Statutes of Ontario, Canada
  • Registered sex offender, a person that has been convicted of sexual offense, or other offense requiring placement on sex offender registry
  • Registered Sex Offender, a 2008 film released at SXSW directed by Bob Byington and starring Kristen Tucker and Gabriel McIver
  • South Ossetia, Republic of South Ossetia
  • Resident Space Object, old residual objects in space like out-of-lifetime satellites, upper stages from rockets or any other object orbiting around Earth for years or decades. The largest civilian RSO is the inoperative Envisat