| Orwer IT & Media Services | Karnataka |
| OSCORP Technologies | |
| Osiz Technologies (P) Ltd | Tamil Nadu |
| OSK IT Solutions Pvt Ltd | |
| Osmania University | Telangana |
| Osmania University Department of Business Management | |
| Osmic Technologies | |
| Osmosys Ltd | Telangana |
| Osource (India) P Ltd | Maharashtra |
| Oswal Cable Ltd | Rajasthan |
| Oswal Technologies | Rajasthan |
| Oswald Labs | Delhi |
| OTFCoder Pvt Ltd | Gujarat |
| Other Service Providers Association of India | Uttar Pradesh |
| OTPless Solutions Pvt Ltd | |
| Otwo Designs | |
| Our Boring Company | |
| Our Web Studio Software Solutions (P) Ltd | Telangana |
| Outline Systems India | |
| Outosurce Services India | |
| Outright Solutions Pvt Ltd | West Bengal |
| Outshade Digital Media | Telangana |
| Outshade Digital Media Pvt Ltd | |
| Outshine Solutions Pvt Ltd | Uttar Pradesh |
| Outsource Data Entry India | Maharashtra |
| Outsource Data Entry Services | Gujarat |
| Outsource SEO | Uttar Pradesh |
| Outsource2India | |
| OutsourceACE IT & ITES Solution Pvt Ltd | Karnataka |
| Outsourcing Technologies | Haryana |
| Overtake Solutions & Technologies Pvt Ltd | Karnataka |
| OweBest Technologies Pvt Ltd | |
| Owle Studio | |
| Own2me | |
| ownAI | |
| Ownlydigital | |
| OX SoftwareS Pvt Ltd | Tamil Nadu |
| Oxemaster IT Systems, LLP | Telangana |
| Oxford College of Education | |
| Oxford Engineering College | |
| OXO Solutions | |
| Oxvsys | |
| Oxvsys Automation Technologies Pvt Ltd | Maharashtra |
| Oxyzo Financial Services Pvt Ltd | Haryana |
| Oyaa | Rajasthan |
| Oyecool | Delhi |
| Oyelabs | Haryana |
| Oyster Technology | Maharashtra |
| OZONESOFT Solutions | |
| Ozosoft | Assam |