| Oil And Natural Gas Corporation Limited | delhi | 9 | |
| Oil And Natural Gas Corporation Limited | gujarat | 1 | |
| Oil And Natural Gas Corporation Limited | west bengal | 13 | |
| Oil And Natural Gas Corporation Limited | jharkhand | 5 | |
| Oil And Natural Gas Corporation Limited | uttarakhand | 25 | |
| Oil And Natural Gas Corporation Limited | andhra pradesh | 10 | |
| Oil And Natural Gas Corporation Limited | gujarat | 4 | |
| Oil And Natural Gas Corporation Limited | gujarat | 11 | |
| Oil And Natural Gas Corporation Limited | andhra pradesh | 3 | |
| Oil India Limited | assam | 1 | |
| Oil India Limited | assam | 9 | |
| Oil Industry Development Board | uttar pradesh | 2 | |
| Oil Industry Safety Directorate | delhi | 1 | |
| Omnibus Industrial Development Corporation | daman diu | 1 | |
| Online Library Catalog, Department of Consumer Affairs | central government | 1 | |
| Online Registration, Tamil Nadu Public Service Commission | tamil nadu | 6 | |
| Ordnance Cable Factory | chandigarh | 2 | |
| Ordnance Depot Talegaon Dabhade | central government | 1 | |
| Ordnance Factory | central government | 2 | |
| Ordnance Factory | west bengal | 2 | |
| Ordnance Factory | telangana | 2 | |
| Ordnance Factory Board | rajasthan | 1 | |
| Ordnance Factory Board, Ordnance Factory Recruitment Centre | central government | 4 | |
| Oriental Bank Of Commerce | haryana | 3 | |
| Oriental Bank of Commerce | central government | 1 | |