- Occupational Health & Safety, Lachine
- Occupational Health Care Professionals, Lachine
- Office & Meeting Equipment & Supplies Rental, Lachine
- Office Furniture & Equipment Rental & Leasing, Lachine
- Office Supplies, Equipment & Office Furniture Stores, Lachine
- Oil & Gas Companies, Lachine
- Oil Industry & Oil Field Equipment & Services, Lachine - Oil Companies
- Oils & Greases, Lachine
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lachine
- Opticians, Lachine
- Optometrists, Lachine - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Lachine
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- Ornamental Nursery Services, Lachine
- Orthodontist, Lachine - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Lachine
- Other Building Materials & Supplies, Lachine
- Other Electrical Products, Lachine
- Other Industrial Goods, Lachine
- Other Lodging, Lachine
- Outdoor Equipment & Accessories, Lachine
- Outdoor Furniture & Patio Furniture, Lachine - Garden Furniture Stores
- Outdoor Furniture Manufacturers, Lachine
- Outerwear Stores, Lachine - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Overhead Door, Lachine
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