| Abbreviation | Definition |
|---|---|
| OCCU | ATS Container Leasing SA |
| OCCX | Occidental Chemical |
| OCCX | Occidental Chemical Corporation |
| OCE | Oregon, California and Eastern Railway |
| OCEU | Oceanex Global Logistics |
| OCFX | Owens Corning Fiberglass |
| OCIU | Arkema |
| OCLU | Overseas Containers |
| OCLU | Overseas Containers Limited |
| OCMU | OC Container |
| OCNU | Ocean Lines |
| OCNU | Ocean Lines Incorporated |
| OCPX | Occidental Chemical (Oxy Vinyls) |
| OCPX | Occidental Chemical Corporation |
| OCR | Oklahoma Central Railroad |
| OCR | Oklahoma Central Railroad Company |
| OCRR | Ottawa Central Railway |
| OCRT | Old Colony Rail Trail |
| OCRT | Otago Central Rail Trail |
| OCRX | Oil Creek Refining |