| Abbreviation | Definition |
|---|---|
| FLY | Financial Literacy For Youth |
| FLY | First Lutheran Youth |
| FLY | Free Lutheran Youth |
| FLY | Fresh Lifelines for Youth |
| FLY | Front Line Youth |
| FLY | The Fellowship Of Lutheran Youth |
| FLYERS | Fun Loving Youth en Route to Success |
| FLYTE | Foundation for Learning and Youth Travel Education |
| FORCE | Friendship, Optimism, Responsibility, Cooperation, and Encouragement |
| FOSY | Friends of Solar Youth |
| FOY | Footies Of Youth |
| FOY | Fountain of Youth |
| FOYA | Fountain of Youth Academy |
| FOYA | Funaab Outstanding Youth Award |
| FOYO | Fair Oaks Youth Outreach |
| FOYO | Friends of Youth Outreach |
| FPY | Fairfax Partnership for Youth |
| FREE | Finally Releasing Emotionally Enthusiasm |
| FROSTY | Federation of Reform Ottawa Senior Temple Youth |
| FSY | For the Strength of Youth |