| Acronym | Definition |
|---|
| POSM | Point of Sale Materials (merchandising) |
| POSM | Plasma Osmolality |
| POSM | Pirates of the Spanish Main (gaming) |
| POSM | Point of Sale Material |
| POSM | Petty Officer Stoker Mechanic (Royal Navy Rating) |
| POSM | Project for Open Source Media |
| POSM | propylene oxide-styrene monomer |
| POSM | Planter of Seeds Ministries (Georgetown, TN) |
| POSM | Patient-Operated Selector Mechanism |
| POSM | Pipeline Observation System Management (Petaluma, CA) |
| POSM | Parallel On-Chip Simultaneous Multi-Threaded (processor type) |
| POSM | Philips Observation and Security Master |
| POSM | Prevention of Sexual Misconduct |
| POSM | Preservation Old Style Morgan (horse association) |