| Acronym | Definition |
|---|
| HRO➣Housing Referral Office |
| HRO➣Hogeschool Rotterdam (The Netherlands) |
| HRO➣Rostock (Germany, auto license plate) |
| HRO➣Human Resources Outsourcing |
| HRO➣Human Resources Office |
| HRO➣Human Resource Outsourcing |
| HRO➣Human Rights Ordinance |
| HRO➣Hampshire Record Office (UK) |
| HRO➣Ham Radio Outlet |
| HRO➣High-Reliability Organization |
| HRO➣Harvard- Radcliffe Orchestra (Cambridge, MA) |
| HRO➣Human Rights Organization |
| HRO➣Hellenic Railways Organisation (Greece) |
| HRO➣Harassment Restraining Order |
| HRO➣Historische Rezensionen Online (German: Historical Reviews Online) |
| HRO➣Harrison, AR, USA - Boone County (Airport Code) |
| HRO➣High Resolution Orthophotography |
| HRO➣Hard Rubber Orchestra (band) |
| HRO➣Humanitarian Relief Operations |
| HRO➣Humanitarian Relief Organization |
| HRO➣Hospital Regional de Occidente (Guatemala) |
| HRO➣High Risk Operation |
| HRO➣Highest Rated Offeror |
| HRO➣Honorary Rural Organizer (trade unions) |
| HRO➣Hostage Release Operation (NATO) |
| HRO➣Holme Roberts & Owen (law firm; now Bryan Cave HRO (Holme Roberts & Owen); various locations |