| Rank | Abbreviation | Meaning |
|---|
| ***** | OPAM | Orthogonal Pulse Amplitude Modulation
| |
| **** | OPAM | Office of Procurement and Assistance Management
| |
| **** | OPAM | Observatorio Permanente Andaluz de las Migraciones
| |
| **** | OPAM | Organic Producers Association of Manitoba
| |
| **** | OPAM | Office of Procurement and Assistant Management
| |
| **** | OPAM | Of Positive African Men
| |
| **** | OPAM | Outdoor Photography Association of Michigan
| |
| *** | OPAM | Oil Painters of America
| |
| *** | OPAM | On-Premise Account Managers
| |
| *** | OPAM | Organisation of Positive African Men
| |
| *** | OPAM | Organ Procurement Agency of Michigan
| |
| ** | OPAM | Overlapped Pulse Amplitude Modulation
| |
| ** | OPAM | Organic Producers Assoc of Manitoba
| |
| * | OPAM | Opera di Promozione per l'Alfabetizzazione nel Mondo
| |
| * | OPAM | Open Pit and Area Mining
| |
| * | OPAM | Operational Amplifier
| |
| * | OPAM | Ocean Physics and Modeling
| |
| * | OPAM | Open Air Museum
| |
| * | OPAM | Opes Prime Asset Management
| |
| * | OPAM | Ohio Public Assistance Manual
| |
| * | OPAM | Online Plant Asset Management
| |
| * | OPAM | Object Perception and Memory
| |
| * | OPAM | Object Perception Attention Memory
| |