List of Companies begin with "O"
- Overseas Education Development Pte Ltd
- Overseas Family School
- Overseas Motors (Private) Limited
- Overseas Movie (Pte) Ltd
- Overseas Resources Pte Ltd
- Overseas Services (Pte) Ltd
- Overseas Star Enterprise Pte Ltd
- Overseas Technical Engineering & Construction Pte Ltd
- Overseas Technology Center Pte Ltd
- Overseas Union Enterprise Ltd
- Overseas Union Insurance Limited
- Overseas Union Land Pte Ltd
- Overseas Union Radio & Electric Co
- Overseas Union Trust Limited
- Overseas United Brothers Trading
- Overseas Valves & Fittings Co Pte Ltd
- Ow Bee Aluminium Works
- Ow Wang Kee Cushion Maker
- Ow Yeong Leng Hardware Trading
- Ow Yong Building Construction
- Owen Trading Co
- Owens Corning (S) Pte Ltd
- Owl International Pte Ltd
- Owling Enterprises Pte Ltd
- Ox Technologies Pte Ltd
- Oxa (Singapore) Pte Ltd
- Oxalis Shipping Co Pte Ltd
- Oxbridge Consulting International Pte Ltd
- Oxford Educare Pte Ltd
- Oxford Graphic Printers Pte Ltd
- Oxford Hotel Pte Ltd
- Oxford Instruments Pte Ltd
- Oxford Jay International Pte Ltd
- Oxford Tailor
- Oxford University Press
- Oxifresh Technology Pte Ltd
- Oxley Construction Pte Ltd
- Oxon AFreight Pte Ltd
- Oxygen Pte Ltd
- Oxyplast Trading (S) Pte Ltd
- OZ Event Planners
- Ozak Seiko (S) Pte Ltd
- Ozone Barter Pte Ltd
- Ozone-Wide Pte Ltd
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