| Abbreviation | Definition |
|---|---|
| OSD | Othello School District |
| OSD | Oxford School District |
| OSD | Oxnard School District |
| OSD | Oxnard School District's |
| OSE | Open School East |
| OSEA | Open School of Ethnography and Anthropology |
| OSEC | Oxford Schools Early College |
| OSERAS | Online School Exam Results Analysis System |
| OSES | Orani South Elementary School |
| OSES | Orlando Science Elementary School |
| OSES | Orlando Science Elementary Schools |
| OSF | Omaha Schools Foundation |
| OSFC | Ohio School Facilities Commission |
| OSFP | Old School Funk Party |
| OSGP | Out-of-School Girls Project |
| OSHC | Out of School Hours Care |
| OSHCQA | Outside School Hours Care Quality Assurance |
| OSHM | Oriental School of Hotel Management |
| OSHM | Oxford School of Hospitality Management |
| OSHS | Ocean Springs High School |