| Acronym | Definition |
|---|
| ORO➣Orono (Amtrak station code; Orono, ME) |
| ORO➣Oxford Reference Online |
| ORO➣Oak Ridge Office (US Department of Energy) |
| ORO➣One Reference Only |
| ORO➣Oak Ridge Operations (DOE) |
| ORO➣Oil Recovery Operations |
| ORO➣Ontario Regional Office (Ontario, Canada) |
| ORO➣Office of Regional Operations (EPA) |
| ORO➣Operations Research Office |
| ORO➣Original Registered Owner (legal term) |
| ORO➣Onde Radio Ovest (band) |
| ORO➣Offsite Response Organization |
| ORO➣Operations Research Organization |