| Abbreviation | Definition |
|---|---|
| OTS | Only The Strong |
| OTS | Over The Shoulder |
| OTTF | Oceania Table Tennis Federation |
| OUA | Ontario University Athletics |
| OUE | Ontario Underwater Explorers SCUBA Club |
| OUHC | Oxford University Hockey Club |
| OUS | Ontario Ultra Series |
| OUSSC | Otago Uni Snow Sports Club |
| OV | Obstructed View |
| OVA | Ontario Volleyball Association |
| OVA | Orlando Volleyball Academy |
| OVB | Ohio Valley Resource for Basketball Officials |
| OVC | Ohio Valley Conference |
| OVFL | Ohio Valley Football League |
| OVFL | Ontario Varsity Football League |
| OVGA | Ottawa Valley Golf Association |
| OVH | OntspanningsVereniging Heerlen |
| OVL | OVeralL results |
| OVO | Ottawa Valley Offroaders |
| OVR | Ohio Valley Region of USA Volleyball |