| OPP | Other People's Property | |
| OPP | Office of Polar Programs at the National Science Foundation | |
| opp. | opposite | |
| opp. | opposition | |
| OPPA | Oregon Professional Photographers Association | |
| OPPA | Ohio Psychiatric Physicians Association | |
| OPPA | Ohio Promotional Product Association | |
| OPPA | Online Privacy Protection Act of 2003 | |
| OPPA | Online Privacy Protection Act | |
| OPPA | Ontario Political Payoff Act | |
| OPPA | Online Privacy Protection Act of 2003 | |
| OPPA | Online Privacy Protection Act | |
| OPPA | Online Privacy Protection Act of 2003 | |
| OPPA | Oregon Public Purchasing Association | |
| OPPA | Operation Plan Package Appraisal | |
| OPPA | Ohio Promotional Products Association | |
| OPPA | Oregon Professional Photographers Association | |
| OPPA | Office of Projects Planning and Analysis | |
| OPPA | Online Privacy Protection Act of 2003 | |
| OPPA | Office of Policy and Practice Alignment | |
| OPPA | Ontario Provincial Police Association | |
| OPPAL | Observatorio de Politicas Publicas para America Latina | |
| OPPAL | Optional Personal Property Assessment Link | |
| OPPAR | Orbiter Project(s) Parts Authorization Request | |
| OPPB | Option to Participate in Progressive Bonus |
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