OPCM
| Acronym | Definition |
|---|---|
| OPCM | Oakland Public Conservatory of Music (California) |
| OPCM | Optimal Pulse Code Modulation |
| OPCM | Old Point Comfort Marina (Fort Monroe, VA) |
| OPCM | Operative Plasterers and Cement Masons (labor union; Laurel, MD) |
| OPCM | Office of Policy Coordination and Management (National Telecommunications and Information Administration) |
| OPCM | Obrona Przeciw Ciemnym Mocom (Polish: Defense Against the Dark Arts; Harry Potter fan forum) |