| Abbreviation | Definition |
|---|---|
| OSCE | Organization to Secure Clinton's Election |
| OSD | Old School Democrat |
| OSPIRG | Oregon Student Public Interest Research Group |
| OTB | Office of Tony Blair |
| OTP | Official Tea Party |
| OTP | One Term President |
| OTP/usa | Official Tea Party USA |
| OULD | Oxford University Liberal Democrats |
| OVC | Open Voting Consortium |
| OVLD | Open Vlaamse Liberalen en Democraten |
| ÖVP | Österreichische VolksPartei |
| OWLC | Ontario Women’s Liberal Commission |
| OYD | Ohio Young Democrats |
| OYH | Ukrainian Nationalist party |
| OYT | One-Year Term |
| P | Platform |
| P | Politics |
| P | Politicsxp |
| P | Primary |
| P | Promises |