| Abbreviation | Definition |
|---|---|
| RSO | Robert Stigwood Organisation |
| RSO | Rock Sh*t On |
| RSO | Rock Shit On |
| RSO | Rock Solid Organization |
| RSO | Rockford Symphony Orchestra |
| RSO | Rough Stud Opening |
| RSOA | Reflective Semiconductor Optical Amplifier |
| RSOA | restricted state of affairs |
| RSOI | Reception Staging and Onward Integration |
| RSOI | Request for Statements of Interest |
| RSOL | Remaining Safe Operating Life |
| RSOL | Rubber Stamp On Label |
| RSOMI | Reception Staging and Onward Movement and Integration |
| RSOP | Radiant Servant of Pelor |
| RSOP | Reconnaisance Selection and Occupation of Position |
| RSOP | Reconnaissance Selection and Occupation of Position |
| RSOP | Reconnaissance Selection Occupation of Position |
| RSOP | Research Support and Outreach Program |
| RSOP | Residential Sex Offender Program |
| RSOP | Result Set of Policy |