| 1 | OSC | OneSky Aviation Services S.p.a. (OneSky Chile) | Callsign: Uncielo, | RCH | AVCODES |
| 2 | OSC | Osaka Municipal Transportation Bureau | | J | TRAFFIC |
| 3 | OSCA | ONE STOP CRITICAL | | | SCAC4 |
| 4 | OSCC | OMNI/SOUTHEASTERN CHEMICAL CO INC | | | SCAC3 |
| 5 | OSCD | OCEAN STATE COURIER AND DELIVERY IN | | | SCAC3 |
| 6 | OSCD | ONE SEVEN TWO ZERO SIX TWO (172062) | | | SCAC4 |
| 7 | OSCH | OSTLUND CHEMICAL CO | | | SCAC3 |
| 8 | OSCH | OSCAR SHIPMANAGEME | | | SCAC4 |
| 9 | OSCH | | City: Oschersleben | D | TRAFFIC |
| 10 | OSCI | OSULLIVAN CARTAGE INC | | | SCAC3 |
| 11 | OSCK | OXYGEN SERVICE COMPANY INC | | | SCAC4 |
| 12 | OSCL | CONTSHIP OCEEAN STAR SERV. | | | SCAC3 |
| 13 | OSCL | OVERSEAS LNG S2 CORPORATION | | | SCAC4 |
| 14 | OSCM | ORION SHIPMANAGEMENT CO | | | SCAC4 |
| 15 | OSCN | OCEAN STAR CONTAINER LINE | | | SCAC3 |
| 16 | OSCN | OCEAN STAR CONTAINER LINES | | | SCAC4 |
| 17 | OSCO | OSCO SHIPPING A/S | | | SCAC3 |
| 18 | OSCO | ORTHOS SHIPPING CORPORATION | | | SCAC4 |
| 19 | OSCP | OMEGA SHIPPING CO INC | | | SCAC4 |
| 20 | OSCQ | OM SEAFOOD CO INC | | | SCAC4 |
| 21 | OSCT | OLSON, STEVEN C TRUCKING | | | SCAC4 |
| 22 | OSCU | OCI COMPANY LTD | | ROK | BIC |
| 23 | OSCX | Oil Seeds Co. | 8/1920-7/1923 | | NAKINA |
| 24 | OSCX | OIL SEEDS CO. | | | PWRC |
| 25 | OSCZ | INTERMODAL SERVICES, INC. | | | PWRC |
| 26 | OSCZ | Intermodal Services Inc. | | | RSRV |
| 27 | OSCZ | INTERMODAL SERVICES, INC. | | | SCAC4 |
