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

Roles and titles
Military technology
  • 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 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
  • 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