| OCN | Oceanography 
| Others |
| OCN | Oceanside, California USA
| Others |
| OCN | oculomotor nucleus
| Others |
| OCN | Offense Cycle Number
| Others |
| OCN | Office de la circulation et de la navigation
| Others |
| OCN | Oldtimer Club Nijkerk
| Others |
| OCN | Oncology Certified Nurse
| Others |
| OCN | Opaskwayak Cree Nation
| Others |
| OCN | Open College Network
| Others |
| OCN | Open Communications Networks
| Others |
| OCN | Open Computer Network
| Others |
| OCN | Open Content Network
| Others |
| OCN | Open Control Network
| Others |
| OCN | Operating Company Number
| Others |
| OCN | Operational Carrier Number
| Others |
| OCN | Optic Connectivity Network
| Others |
| OCN | Optical Characterization and Nanophotonics
| Others |
| OCN | Optically Clear Nuclei
| Others |
| OCN | Optimal Channel Networks
| Others |
| OCN | Optimal Climate Normals
| Others |
| OCN | Opwijkse Computer Nerds
| Others |
| OCN | Orchidee Carbon Nitrogen
| Others |
| OCN | Order Control Number
| Others |
| OCN | Oregon Center for Nursing
| Others |
| OCN | Oregon Conservation Network
| Others |
| OCN | Oregon Curriculum Network
| Others |
| OCN | Original Called Number
| Others |
| OCN | Original Camera Negative
| Others |
| OCN | Original Color Negative
| Others |
| OCN | Originally Called Number
| Others |
| OCN | Orion Cinema Network
| Others |
| OCN | Ortho Cresol Novolac
| Others |
| OCN | Orthodox Christian Network
| Others |
| OCN | Orthodox Christian News
| Others |
| OCN | Oscillating Capillary Nebulizer
| Others |
| OCN | osteocalcin
| Others |
| OCN | Other Carrier Networks
| Others |
| OCN | Overly Complicated Nonsense
| Others |
| OCN | Owners Corporation Network
| Others |