| S.No. | Organization | Contact Number |
|---|---|---|
| 1 | Oasis Fertility | 1800-300-11000 |
| 2 | Oberoi Hotels & Resorts | 1800-112-030 |
| 3 | Odisha State Civil Supplies Corporation Limited (OSCSC) | 1800-555-6760 |
| 4 | Odisha State Road Transport Corporation (OSRTC) | 1800-345-1122 |
| 5 | Odisha Tourism | 1800-2097-123 |
| 6 | OK Play India Limited | 1800-300-09343 |
| 7 | Okaya Power Private Limited | 1800-102-8808 |
| 8 | Olive Telecommunication Private Limited | 1800-266-65483 |
| 9 | Omaxe Limited | 1800-102-0064 |
| 10 | Omega Elevators | 1800-266-6342 |
| 11 | Omron Healthcare India Private Limited | 1800-419-0492 |
| 12 | Organic India Private Limited | 1800-180-5153 |
| 13 | Organic India Store | 1800-180-5153 |
| 14 | Orient Electric Limited (OEL) | 1800-103-7574 |
| 15 | Orient Flight School (OFS) | 1800-425-4359 |
| 16 | Orion Pest Solutions Private Limited | 1800-419-8181 |
| 17 | ORRA Fine Jewellery Private Limited | 1800-266-1888 |
| 18 | ORRA Store | 1800-266-1888 |
| 19 | Overseas Placement Bureau | 1800-180-2038 |
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