RSO

RSO can refer to any of the following:

* Regional Security Officer, a DS Special Agent in charge of security at a U.S. Embassy
* RSO Records, a record label formed by Robert Stigwood in the late 1960s
* Range Safety Officer, a person responsible for the safe use of rocket vehicles
* Reconnaissance Systems Officer, military personal in charge of optic equipment and radar-scrambling equipment in a spy plane
* Rogers Sportsnet Ontario
* Radiation Safety Officer, a person responsible for the safe use of radiation and radioactive materials
* Real Souled Out, a branch of the Presbyterian Church of Wales's youth establishment
* Registered sex offender, a person that has been convicted of sexually abusing another person or animal
*The Repeat Sex Offenders,a controversial boy band based in St. Augustine, Florida
* "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
* South Ossetia, Republic of South Ossetia
* Revolutionary Socialist Organization, a Trotskyist group from Austria
* Reliable Snapshot Overflow, a model rendering error found in multiplayer Source engine games