| Acronym | Definition |
|---|
| NPOS➣National Pet Owners Survey |
| NPOS➣Network Processing Operating System (software; Teja Technologies) |
| NPOS➣New Plymouth Operatic Society (New Plymouth, New Zealand) |
| NPOS➣Nurse Practitioners of Saskatchewan (Canada; est. 2001) |
| NPOS➣North Pacific Orthopaedic Society (est. 1925; Portland, OR) |
| NPOS➣North Pacific Organ and Sound (Redmond, WA) |