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• Oberoi Hotels & Resorts - 1800-11-2030

• Oceanic Consultants - 1800-103-1400

• Ocus Skyscrapers Reality Limited - 1800-102-3344

• Oilco Services (India) - 1800-11-2777

• Olive - 1800-266-65483 (OLIVE)

• Om Radianz Infra - 1800-103-2299, 1800-266-0809

• Om Sai Ayurveda - 1800-11-7841

• Om Sai Global - 1800-103-2424

• Omega Watches - 1800-11-9191, 1800-102-9191

• Omnilife India - 1-800-200-6664

• One For All - 1800-102-3299

• Onida - 1-800-3009-9000

• Online Grievance Information System (OGIS), Haryana - 1800-180-2200

• Oracle - 1800-425-6725

• Oracle Education / Oracle University Training Centers - India - 1800-425-8877

• Oral-B - 1-800-200-9944

• Orchid Hotel - 1-800-22-5432

• Oriensoft Technologies - 1-800-22-5171

• Orient Flight School - 1800-425-4359 (IFLY)

• Oriental Bank of Commerce - 1800-180-1235, 1800-345-2424

• Oriental Insurance - 1800-425-2002, 1800-102-6425

• Orion Mobiles - 1800-103-3330

• Orissa Information Commission (OIC) - 1800-345-6777

• Orris Infrastructure - 1800-212-2222

• Ortel Communications - 1800-419-6060

• Oster - 1-800-102-6300

• Overseas Worker's Resource Centre (OWRC) - 1800-11-3090

• Oxford Software Institute - 1800-11-7799

• Oxygen TV - 1800-209-3133

• Oyster - 1800-102-8999