RSO

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

• 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 Diplomatic Security Service Special Agent in charge of security at a US embassy
• Regional Security Office, office in a US embassy or consulate for the Diplomatic Security Service
• Riddare av Svärdsorden, Knight of the Order of the Sword
• Reconnaissance systems officer, operator of surveillance systems and equipment on a Lockheed SR-71 Blackbird aircraft

• "Radio Symphony Orchestra", used by a number of orchestras:
• Danish National Symphony Orchestra, based in 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
• Richardson Symphony Orchestra, based in Richardson, Texas
• Roanoke Symphony Orchestra, based in Roanoke, Virginia
• 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 and former insurgent group in Myanmar (Burma)

• Raupenschlepper, Ost, a fully tracked World War II German artillery tractor
• Radschlepper Ost, a wheeled World War II German artillery tractor

• Railway Sub Office (1855–1905), a British Royal Mail office which received mail directly from rail transport
• Reactive Search Optimization, problem-solving methods with integrated online machine-learning capabilities
• Revised Statutes of Ontario, the provincial laws of Ontario, Canada
• Registered sex offender, a person listed on a sex offender registry
• Republic of South Ossetia, a partially recognised country in the South Caucasus
• Resident Space Object, any man-made object in Earth orbit no longer used by anyone
• RSO, musical duo consisting of American musician Richie Sambora and Australian musician Orianthi
• Rick Simpson Oil, a form of cannabis concentrate
• Red Star OS, also abbreviated as RSOS, is a North Korean operating system