OCST
| Acronym | Definition |
|---|---|
| OCST | Office of Commercial Space Transportation (US FAA) |
| OCST | One Course Surface Treatment (pavements) |
| OCST | Organizzazione Centro Sud Trapianti (Italian: South-Central Transplant Organization; Rome, Italy) |
| OCST | Orange County Supertones (band) |
| OCST | Office of Cable Signal Theft |
| OCST | Overcast (also seen as OVCST) |
| OCST | Ohio Center for Substitute Teachers |