| Ol Fr | Lachine | ol |
| Ol Lemire | Sainte-Therese | ol |
| Ol Ro | Montréal | ol |
| Ol' Sweet | Montréal | Tout Commerces au détail |
| Ola Beauty | Saint-Eustache | Beauty & Fitness, Hairdressers & Beauty Salons |
| Olameter Inc | Montréal | Electricians |
| Old Brewery Mission | Montréal | Associations |
| Old Brewery Mission (Clark) | Montréal | Emergency Shelters |
| Old Brewery Mission (Maisonneuve E) | Montréal | Emergency Shelters |
| Old Calendar Greek Orthodox Church AnnunciationOf Holy Mother & St Nektarios | Montréal | Calendars |
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| Old Dublin Pub | Montréal | Brasseries |
| Old Navy | Montréal | Clothing Stores |
| Old Navy | Montréal | Clothing Stores |
| Old Port and Colts Cigars Company Ltd | Longueuil | Agri-food |
| OLD PORT OF MONTREAL | Montréal | Blue Pages |
| Old Times Antiques | Petite-Bourgogne Et Griffintown | Tout Commerces au détail |
| Olda Pneu Expert | Montréal | Tire Shop |
| Oldham Batteries Canada Inc. | Anjou | Tout Commerces au détail, Tout Entreprises et services |
| Olga Ovtchinnikova Notaire et Conseillére Juridique | Repentigny | Commissioners for Oaths |
| Oli & Eve Maison de Coiffure | Longueuil | Beauty & Fitness, Hairdressers & Beauty Salons |
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| Oli Électrique Inc | Laval | Electricians |
| Oligo Medic Inc. | Laval | Life Sciences and Health Technologies (LSHT) |
| Oligo Médic | Montréal | Life Sciences and Health Technologies (LSHT) |
| Oligo Professionnel | Montréal | Tout Entreprises et services |
| Oliko Design | Montréal | Commercial Artists |
| Olive & Gourmando | Montréal | Tout Bars et restaurants |
| Olive & Olives | Petite-Patrie | Tout Commerces au détail |
| Olive & Olives Inc | Saint-Lambert | Candles |
| Olive Et Gourmando Inc | Montréal | Breakfast Restaurants |
| Olive Orange | Montréal | Caterers |
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| Oliver | Montréal | Plumbing |
| Oliver Thomas L Dr | Westmount | Dentists |
| Olivier (Sr) Maître Dussaut | Saint-Agapit | sr |
| Olivier Fortin-Thibeault, Courtier Immobilier | Richmond | Real Estate Offices, Courtier immobilier |
| Olivier Foulquier Orthésiste | Boucherville | Chemical & Pressure Cleaning Systems |
| Olivier Labrie Massothérapeute à Domicile | Longueuil | Massage Therapy |
| Olivier Marjolaine | Outremont | Artists |
| Olivier The Barber , Barbier Privé | La Prairie | Men's Hairdressers & Barber Shops |
| Olivieri | Montréal | Audiovisual Production Services |
| Olivierremax | Québec | Real Estate Offices, Courtier immobilier |
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| Olix | Sherbrooke | Shopping Mall |
| Olly Fresco's | Montréal | Automobiles, Grocery Stores |
| Olmsted Outerwear | Petite-Patrie | Tout Commerces au détail |
| Olton Marketing & Communication Inc | Montréal | Calendars |
| Olulu Nails | Brossard | Beauty & Fitness, Hairdressers & Beauty Salons |
| Oly Anger Tattoo | Montréal | Tout Commerces au détail |
| Olymbec | Montréal | Tout Entreprises et services |
| Olymel | Saint-Hyacinthe | Tout Entreprises et services |
| Olymel Anjou | Anjou | Agri-food |
| Olymel Food Service | Boucherville | Tout Entreprises et services |
