Companies catalogue
- O'Connell Law Group, Toronto
- OISE Library, Toronto
- Oakville Child Care Subsidy, Oakville
- Oakville Christian Centre, Oakville
- Oakville Enterprises Corporation (OEC), Oakville
- Oasis Clothing Bank, Toronto
- Occhiuto I, Toronto
- Oceanic Commercial Inc, Toronto
- OfficeTeam, Toronto
- Old K Fried Chicken, Toronto
- Olwedo Law, Toronto
- Olympium Fitness Ctr, Toronto
- Oma Chiropractic & Wellness, Toronto
- Omei Restaurant, Richmond Hill
- OneClass, Toronto
- Ontario Association of Acupuncture and Traditional Chinese Medicine, Toronto
- Ontario Chinese Restaurant And Food Service Association, Toronto
- Ontario Civilian Commission on Police Services, Toronto
- Ontario Court of Justice, Toronto
- Ontario Court of Justice, Toronto
- Ontario Electronics Service, Brampton
- Ontario Energy Group, Kitchener
- Ontario Federation For Cerebral Palsy, Toronto
- Ontario Financing Authority, Toronto
- Ontario Fresh & Tasty, Toronto
- Ontario Medical Oncology Assn, Toronto
- Ontario Ministry of Transportation, Toronto
- Ontario Ministry of the Environment and Climate Change, Toronto
- Ontario Ministry-Abrgnl Affrs, Toronto
- Ontario Municipal Affairs, Toronto
- Ontario Society of Senior Citizens Organizations, Toronto
- Ontario Solar & Wind Inc, Hamilton
- Ontario Tree Farms, Vaughan
- Ontario Works, Guelph
- Operation Smile Canada, Toronto
- Orde Daycare, Toronto
- Origination Noodle House, Toronto
- Orlando's 2 for 1 Jerk Chicken, Toronto
- Ort Canada, Toronto
- Ort Toronto, Toronto
- Osborne Collection of Early Children's Books, Toronto
- Osmow's Steeles (Authentic Mediterranean Grill), Toronto
- Osmow’s Grill, Mississauga
- Ossington Chiropractic and Rehabilitation, Toronto
- Osteoporosis Canada, Toronto
- Ostomy Toronto, Toronto
- Otis Canada Inc, Burlington
- Our Village, Toronto
- Ox Noodle, Vaughan