RSO

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 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

Organisations

 * "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)

Military technology

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

Other

 * 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 separatist organization in Georgia
 * 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