| IOPA | Idaho Osteopathic Physicians Association 
| Others |
| IOPA | Independent Oil Producers Agency
| Others |
| IOPA | Industrial Organizational Psychology Association
| Others |
| IOPA | Institute for Orkornerei Pastoralists Advancement
| Others |
| IOPA | Institute Of Public Administration
| Others |
| IOPA | Intensive Outpatient Program for Adults
| Others |
| IOPA | Intercultural Organization Promoting Awareness
| Others |
| IOPA | Internal Oversight and Performance Assurance
| Others |
| IOPA | International Office Products Alliance
| Others |
| IOPA | Internet of Protocols Alliance
| Others |
| IOPA | Internet Open Protocol Alliance
| Others |
| IOPA | Intra oral peri apical
| Others |
| IOPA | Intraoral Periapical
| Others |
| IOPA | Investors for Opioid Pharmaceutical Accountability
| Others |
| IOPA | Irish Opinion Poll Archive
| Others |
| IOPA | Islands On PSK Award
| Others |
| IOPA | Islands Organic Producers Association
| Others |