- ONGC Limited, Bandra East
- ONGC Ltd ,Agartala
- ONGC, BPA BA Platform,
- ONKAR EXIM PVT. LTD
- Only All That Inc
- Onpharno Lifesciences pvt Ltd
- Onshore Construction Company Pvt. Ltd.
- Ontime Maintenance Services
- Onyx Pharma
- OOCL (INDIA) PRIVATE LIMITED MUMBAI
- Ooms Polymer Modified Bitumen Pvt Ltd
- OP Commerce Online Pvt Ltd
- Opal Asia Logistics (India) Pvt. Ltd.
- Opal Impex
- oper net pvt .ltd
- Operahouse wale
- OPERATIONAL ENERGY GROUP INDIA LIMITED
- OPILI CHEM PRIVATE LIMITED
- OPPORTUNITY IN INDIA
- Optimal Floors & More LLP
- Optimum tech services
- OPTIMUS DRUGS PVT LTD
- OPTIMUS ENVIROPRO PVT LTD
- Optimus HR Group
- Optimus Pharma
- Optimus Pharma Pvt Ltd
- OPTMECH ENTERPRISES
- Opulent Pharma
- Opulentus Overseas Careers
- OPUS REFINERY PRIVATE LIMITED
- Oracle Medicare Private Limited
- Oracle World Wide
- Orange Chemicals Limited
- Orange Electric and Hardware
- Orange Enterprise
- Orange Hotels And Restaurants Pvt. Ltd
- Orange Technical Solutions
- Orbicular Pharmaceutical Technologies Pvt Ltd
- Orbit Corporation
- Orbit Enterprises
- Orbit International
- Orbit Lifescience
- ORBIT MARKETING
- Orbit Scientific Products
- ORBOND AQUATECH PVT. LTD.
- Orchev Pharma Pvt Ltd
- Orchid Polycoats
- Orchid Trading Company
- OREX PHARMA PVT. LTD
- Organic 121 Private Limited
- Organic Chem Trader
- Organic Chemicals RIG Ltd
- Organic Industries Private Limited
- Organic Industries Pvt Ltd
- Organic Pesticide Industries
- Organica Biotech Pvt Ltd
- ORGANISCH EXIM LLP
- Organo Chemical Industries
- ORGANO MAGIC PACKAGING
- Orginpulse Pharmaceuticals Pvt Ltd
- Orgvedic Private Limited
- Orien Enterprises
- Orient express ship management ltd. (Mum)
- Orient Paper and Industries Limited
- Orient Ship Management & Manning Pvt. Ltd
- Orient tourism pvt. ltd.
- Orient Trade Impex
- Orienta Cine Advertising
- Oriental Aromatics Ltd
- Oriental Electrical Connectors LLP
- ORIENTAL EXIM AGENCY (Manglore)
- Oriental Foundry Pvt. Ltd
- Oriental Lotus Hotel Supplies Pvt.Ltd
- ORIENTAL MECHANICAL WORKS PVT LTD
- Oriental Rail Infrastructure Limited
- Oriental Veneer Product Ltd
- Oriental Weaving Processing Mills Pvt Ltd
- Oriental Yeast India Private Limited
- Orientti
- Origami Cellulo Pvt Ltd
- ORIGIN SCIENTIFIC
- ORIOMAX TRADING CORP
- Orion Agencies Limited
- Orion Appliances Pvt Ltd
- Orion Chem Private Limited
- ORION CHEMICALS
- Orion India Systems Private Limite
- ORION ULTRASONICS
- Oriship Agency
- Orison & Co.
- Ornate Infra Holding Pvt.Ltd.
- Ornella Enterprises
- ORS CORPORATION
- Ortin Laboratories Ltd
- OSA Exim Private Limited
- Osaka Rubber Private Limited
- Osaka Rubber Products
- Osborn Lippert India Pvt. Ltd
- OSCAR ULTRASONICS PVT LTD
- OSCT India
