RSO

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

• 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.
• Revised Statutes of Ontario, Canada
• 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
• Raupenschlepper Ost, a fully tracked WW II German artillery tractor
• Reconnaissance Systems Officer, military personal in charge of optic equipment and radar-scrambling equipment in a spy plane
• Riverside Sheriff's Office, law enforcement provider for much of Riverside County, CA.
• Rogers Sportsnet Ontario, a television station in Ontario, Canada
• RSO Records, a record label formed by Robert Stigwood in the late 1960s
• Registered sex offender, a person that has been convicted of sexually abusing another person or animal
• Registered Sex Offender, a 2008 film released at SXSW directed by Bob Byington and starring Kristen Tucker and Gabriel McIver
• "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
• South Ossetia, Republic of South Ossetia
• Rohingya Solidarity Organization, a political organization of Burma (Myanmar) struggling for the basic human rights for the people of the Arakan State, especially Rohingya Muslims
• Reactive Search Optimization, problem-solving methods with integrated online machine-learning capabilities.