- Occupational Health & Safety, Okotoks
- Occupational Health Care Professionals, Okotoks
- Office Planning & Design, Okotoks
- Office Supplies, Equipment & Office Furniture Stores, Okotoks
- Oil & Gas Companies, Okotoks
- Oil & Gas Consultants, Okotoks
- Oil & Gas Well Drilling Services, Okotoks
- Oil Change & Lubrication, Okotoks - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Okotoks - Oil Companies
- Oil Well Equipment & Supplies, Okotoks
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Okotoks
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- Opticians, Okotoks
- Optometrists, Okotoks - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Okotoks - Eye Clinics
- Ornamental Metal Work, Okotoks - Steel, Iron, Bronze, etc
- Ornamental Nursery, Okotoks
- Ornamental Nursery Services, Okotoks
- Orthodontist, Okotoks - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Okotoks
- Outdoor Equipment & Accessories, Okotoks
- Overhead Door, Okotoks
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