| Abbreviation | Definition |
|---|---|
| OAF | Open Arts Festival |
| OBF | Oregon Bach Festival |
| OBF | Oregon Brewers Festival |
| OCDF | Open City Documentary Festival |
| ODF | The Ottawa Dressage Festival |
| OFAM | Oregon Festival of American Music |
| OGF | Oklahoma Garden Festival |
| OIAF | Ottawa International Animation Festival |
| OIBF | Oklahoma International Bluegrass Festival |
| OIFF | Odesa International Film Festival |
| OIFF | Ohio Independent Film Festival |
| OIFF | Orcas Island Film Festival |
| OIFF | Orlando International Film Festival |
| OIFF | Orlando International Fringe Festival |
| OIFF | Oxford International Film Festival |
| OIMF | Okinawa International Movie Festival |
| OIMF | Olympia Independent Music Festival |
| OJLF | Oxford Junior Literary Festival |
| OMF | Oakland Music Festival |
| OOFF | Outdoor Outdoor Film Festival |