| Ocean Websoft Pvt Ltd | Uttar Pradesh |
| Octacore Technologies | |
| Octagotech | |
| Octakris It Solutions, LLP | |
| Octalogic Tech, LLP | |
| Octel Networks | |
| Octmark Technologies | |
| Octonion Design Solutions, LLP | |
| Octopus Tech Solutions Pvt Ltd | |
| Ocufox Technologies Pvt Ltd | |
| Odan Infotech, LLP | |
| Oddeven Infotech Pvt Ltd | |
| oDeskwork Pvt Ltd | Rajasthan |
| Odisha State Open University | |
| Odisha University of Technology and Research | |
| OdiTek Solutions Pvt Ltd | Odisha |
| Odox SoftHub | |
| Odyssey IT Solutions | |
| Odyssey Technologies Ltd | Tamil Nadu |
| Odzonic Technologies and Solutions Pvt Ltd | |
| Of2On Software Solutions | |
| OFB Tech Pvt Ltd | |
| Ofek Software Technologies | Kerala |
| Offcoders Solutions | |
| Offee | |
| Office 2000 Solutions Pvt Ltd | Maharashtra |
| Office24by7 Technologies Pvt Ltd | |
| Offshore Data Entry | Gujarat |
| Offshore Infotech | Gujarat |
| Offshore Online Data Entry | Tamil Nadu |
| Offshore Outsourcing India | Gujarat |
| Oganro Pvt Ltd | |
| Ogen Infosystem Pvt Ltd | |
| Oghatech | |
| OGI Technologies | |
| Oglacs | Delhi |
| Oglitz Software Pvt Ltd | |
| Ogma IT Conceptions Pvt Ltd | |
| OHM Clouds Systems Integration and Infrastructure, LLP | Tamil Nadu |
| Ohm Solutions Pvt Ltd | Tamil Nadu |
| OhMyScript | |
| Ohmyweb | |
| Ojas Technologies Pvt Ltd | |
| OkCredit Psi Phi Global Solutions Pvt Ltd | Karnataka |
| Okulus Digital | |
| Ola Electric Mobility Pvt Ltd | |
| Olabi | Karnataka |
| Olatech Solutions Ltd | Maharashtra |
| Olatech Solutions Ltd | |
| Olbuz Consulting | Gujarat |