| 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 |