India Toll-Free Nos. Directory (Letter O)
| Oberoi Hotels & Resorts | 1800-11-2030 |
| Oceanic Consultants | 1800-103-1400 |
| Oilco Services (India) | 1800-11-2777 |
| Omega Watches | 1800-11-9191, 1800-102-9191 |
| One For All | 1800-102-3299 |
| Online Grievance Information System (OGIS), Haryana | 1800-180-2200 |
| Oracle | 1800-425-6725 |
| Oracle Education / Oracle University Training Centers - India | 1800-425-8877 |
| Orchid Hotel | 1-800-22-5432 |
| Oriensoft Technologies | 1-800-22-5171 |
| Orient Flight School | 1800-425-4359 (IFLY) |
| Oriental Bank of Commerce | 1800-345-2424 |
| Oriental Insurance | 1800-425-2002, 1800-102-6425 |
| Ortel Communications | 1800-419-6060 |
| Oster | 1-800-102-6300 |
