| Abbreviation | Definition |
|---|---|
| OPY | Overseas Participating Youth |
| OSFY | On Stage For Youth |
| OTAY | Organized Trips Around Youth |
| OTY | Orchestra for Talented Youth |
| OVY | Optimist Volunteers for Youth |
| OY | Older Youth |
| OY | Opportunity For Youth |
| OYA | Opportunity Youth Academy |
| OYA | Orinda Youth Association |
| OYA | Orlando Youth Alliance |
| OYA | Outdoor Youth Adventures |
| OYAB | Ohio Youth Advisory Board |
| OYAO | Osceola Youth Activities Organization |
| OYAP | Ontario Youth Apprenticeship Program |
| OYAP | Ontario Youth Apprenticeship Programs |
| OYB | Olathe Youth Baseball |
| OYB | Oshkosh Youth Baseball |
| OYC | Oakland Youth Chorus |
| OYC | Ocean Youth Club |
| OYC | Opportunity Youth Collaborative |