| Abbreviation | Definition |
|---|---|
| OTN | Out There News |
| OTOR | On Track Off Road (Magazine) |
| OTQ | Orthopaedie-Technik Quarterly |
| OTR | Off The Record |
| OTR | One True Ring |
| OTS | Opportunity To See |
| OTS | Orbital Test Satellite |
| OTT | One True Thing |
| OTV | Oddcast Television |
| OTV | Orissa Television |
| OTX | Open Theater X |
| OTX | Operational Transmitter |
| OUP | Oxford University Press |
| OV | Occasional Video |
| OV | Original Villian |
| OVA | Orange Vermillion Apple |
| OVA | Original Version Animated |
| OVA | Original Video Action |
| OVA | Original Video Animation |
| OVN | Ojai Valley News |