| OPSN | Open Packet Switching Network | |
| OPSn | Optical Physical Section n | |
| OPSN | Out Patient Surgery North | |
| OPSN | Organised Private Sector in Nigeria | |
| OPSN | Official Program Standards Notification | |
| OPSN | Output Protocol Sequence Number | |
| OPSN | Open Public Services Network | |
| OPSN | Online Portfolio Social Networks | |
| OPSN | Organization of PhD Students in Nursing | |
| OPSO | OverPressure ShutOff | |
| OPSO | On Public Service Only | |
| OPSO | Older People Speak Out | |
| OPSO | Osteopathic Physicians and Surgeons of Oregon | |
| OPSO | Optimized Particle Swarm Optimization | |
| OPSO | Ouachita Parish Sheriff's Office | |
| OPSO | Office of Pipeline Safety Operations | |
| OPSO | Overlapping Pairs Sparse Occupancy | |
| OPSO | Optimized Promotions Sell Out | |
| OPSOSA | OPeratore SOcio SAnitario | |
| OPSP | Shekupura, Pakistan | |
| OPSP | Open Project and Selection Process | |
| OPSP | One Page Strategic Plan | |
| OPSP | Open Project Selection Process | |
| OPSP | Oleandomycin Polymixin Sulphadiazine Perfringens | |
| OPSP | Overarching Productive Sector Policy |
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