| Name | Specialisation | Website/email | City/ State |
| OCL Infomatics Ltd. | Development and Implementation of computer software, Packages - Catalogue inquiry system, ERP
Implementation | oclinfo@vsnl.com | Cochin |
| Octon Technologies Ltd. | Internet Technology, E-commerce Solutions, Client Server | http://octon.com/ | Pune |
| Omega Interactive Technologis Ltd. | Web & E- Commerce, Database, Multimedia, IT- Enabled Services | oitl@vsnl.com | Mumbai |
| Omega Net India (P) Ltd | AS/4000 Software services, Java & E-commerce Solutions, Partners in ERP retail implementation | http://nasscom.org/template/rshroff@omegasystemsusa.com | New Delhi |
| one two three india.com | Internet, E-Commerce, Portals | http://123india.com/ | Calcutta |
| ONICRA Credit Rating Agency of India Ltd | Individual Credit Rating | http://onicra@vsnl.com/ | New Delhi |
| Online Media Solutions Limited | Internet Service Provider, E-Commerce, Multimedia and Digital Studio, Software Development | http://omsolutions.com/ com | Hyderabad |
| Onward Novell Software (I) Ltd. | Software Distribution, Networking and Technical Support, NetWork Consultancy Education, Education, Developer Services | http://novell.com/ | Mumbai |
| Onward Technologies Limited | Client Server Applications Projects, Engineering Application - CAD, CAM, CAE, Middleware, Legacy Systems to Client Server Solutions, Novell Product Centric Software Development, Software Product Development | http://onwardgroup.com/ com | Mumbai |
| Open Technologies India Pvt. Ltd. | Networking Solutions, E- Commerce and Web related activities | http://opentechindia.com/ com | Noida |
| Opusasia Technologies Pvt. Ltd | Enterprise solutions, Internet Technologies & networking, Software solutions, Health care solutions | http://opusasia.com/ | Hyderabad |
| Oracle Software India Ltd. | RDBMS, Enterprise Resource Planning Software/ Enterprise Application Development Tools, Datawarehousing, E-commerce, E-Governance | http://oracle-india.com/ com | New Delhi |
| Oracle Solutions Services (India) Pvt
Ltd | Technology Solutions, Consultancy - ERP, CRM, Oracle Applications, Consultancy - Technical Services | vbhushan@ ch.oracle.com | Bangalore |
| Orbit Cybertech Ltd | B2B portals, technology consultancy, CSP - commerce service providers | http://orbitcybertech.com/ | Mumbai |
| Orient Information Technology Ltd. | Offshore Software Development, ERP Products; Implementations & Training Services, Fixed Priced Applications, On-site Consulting Services | http://orientinfotech.com/ infotech.com | Mumbai |
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