| Abbreviation | Definition |
|---|---|
| ODY | Owensboro Diocese Youth |
| ODYI | Oakland Division Youth Issues |
| ODYIWG | Oakland Division Youth Issues Work Group |
| ODYS | Ohio Department of Youth Services |
| OFTC | Old Firehouse Teen Center |
| OFY | Opportunities for Youth |
| OFY | Opportunity for Youth |
| OFY | Options for Families and Youth |
| OFY | Options For Youth |
| OFY | Outdoors For Youth |
| OHPL | Orena Humphry Public Library |
| OKAY | Organized Korean American Youth |
| OKY | Organization of Kurdish Youth |
| OMGAA | Osseo Maple Grove Athletic Association (youth athletics; Maple Grove, MN) |
| OMGES | Oh Mein Gott Ein Shiny |
| OMYG | Otahuhu Mangere Youth Group |
| ONDY | Ontario New Democratic Youth |
| ONE | One Natural Experience |
| OOY | Office on Youth |
| OPY | One Planet Youth |