| Abbreviation | Definition |
|---|---|
| OYF | Opportunity Youth Forum |
| OYH | Orygen Youth Health |
| OYI | Older Youth Initiatives |
| OYL | Oceanside Youth Lacrosse |
| OYMP | Orillia Youth Music Program |
| OYN | Ogaden Youth Network |
| OYN | Open Youth Networks |
| OYN | Opportunity Youth Network |
| OYO | Oakland Youth Orchestra |
| OYO | Oakland Youth Orchestras |
| OYO | Open Youth Organization |
| OYP | Oceanside Youth Partnership |
| OYP | Oconee Youth Playhouse |
| OYP | Oklahoma Youth Philharmonic |
| OYP | Online Youth Programs |
| OYP | Ontario Youth Parliament |
| OYP | Openarms Youth Project |
| OYP | Opportunity Youth Partnership |
| OYP | Overseas Youth Programmes |
| OYPG | Oromo Youth Poetry Group |