Professional organizations Abbreviations and Acronyms

1. OPA
   Oregon Pilots Association
2. OPA
   Oil Producers Association
3. OPA
   Oklahoma Psychological Association
4. OPC
   Ontario Press Council
5. OPCEA
   Ontario Pollution Control Equipment Association
6. OPCMIA
   Operative Plasterers and Cement Masons International Association of the United States and Canada
7. OPCS
   Organisation de la Patrouille Canadienne de Ski
8. OPEC
   Organization of The Petroleum Exporting Countries
9. OPEI
   Outdoor Power Equipment Institute, Inc.
10. OPFA
    Ontario Professional Foresters Association
11. OPS
    Ophthalmic Photographers' Society
12. OPSA
    Association for Office Professionals of South Africa
13. OPSC
    Osteopathic Physicians and Surgeons of California
14. OPSM
    Optical Prescription Spectacle Makers
15. OPSO
    Osteopathic Physicians and Surgeons of Oregon
16. OPSS
    Optics and Photonics Society of Singapore
17. OPTA
    Organic Producers Trade Association
18. OPTA
    Oklahoma Physical Therapy Association
19. OPTA
    Orthotic Prosthetic Technological Association
20. OPTA
    Ohio Physical Therapy Association

Last updated: May 23, 2020 — Total entries: 5,062