| Du Campanile Résidence | Québec | du |
| Du Pinceau au Plumeau | Montréal | Painters |
| Dualshoot | Montréal | Camera & Photo Equipment Stores |
| Dubo Rénove Inc | Lachine | Home Improvement |
| Dubois Agrinovation | Châteauguay | Tout Entreprises et services |
| Dubois Marine Inc. | Montréal | Boat Repair & Maintenance |
| Dubé & Tétreault CPA S E N C R L | Longueuil | Bookkeeping |
| Dubé Loiselle | Saint-Bruno | Tout Entreprises et services |
| Dubé Légal inc. | Centre-Ville | Tout Entreprises et services |
| Duc de Lorraine | Côte-Des-Neiges | Tout Commerces au détail |
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| Duc Thai Hy Dao | Montréal | hy |
| Ducap Bourret Elaine | Laval | Chiropodists |
| Duchaine Edith | Repentigny | Chiropodists |
| Ducharme Esthetique | Montrval | Beauty & Fitness, Hairdressers & Beauty Salons |
| Duchesnay inc. | Blainville | Life Sciences and Health Technologies (LSHT) |
| Duchesne Immobilier | Bchat | Real Estate Offices, Courtier immobilier |
| Duché de Bicolline | Mauricie | Tout Arts et divertissement, Tout Tourisme et hôtels |
| Duclos Alexandra Acupuncteure | Montréal | Acupuncturists |
| Duclos Ringuette Inc. | Varennes | Tout Entreprises et services |
| Ducolon Retail Group | Châteauguay | Catalogue & Online Shopping |
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| Ducs De Montrichard | Brossard | Beverage Distributors & Bottlers |
| Dudemaine Drain | Montréal | Plumbing |
| Dufour Charbonneau Brunet & Associés Inc | Greenfield Park | Bookkeeping Software & Accounting Systems |
| Dufour Charbonneau Brunet Et Associées Inc | Brossard | Accounting Services |
| Dufour Jean Jacques Dr | Montréal | Health Services |
| Dufourd, Dion avocats | Côte-Des-Neiges | Tout Entreprises et services |
| Dufresne François Artisan Forgeron | Waterloo | Art Metal Work |
| Dufresne Sylvain Avocat | Montréal | Bankruptcy Lawyers |
| Dugas & Dugas | Sainte-Geneviève | Commissioners for Oaths |
| Dugas Chantal | Montréal | Collectibles |
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| Dulong Medtech Inc. | Montréal | Tout Entreprises et services |
| Dulude Taylor Inc | Montréal | Car Insurance |
| Duluth Auto Glass | Montréal | Auto Glass & Windshields |
| Dumont Pierre & Associés | Brossard | Bookkeeping Software & Accounting Systems |
| Dumont Pierre & Associés | Brossard | Bookkeeping Software & Accounting Systems |
| Dumont Solutions Inc | Verdun | Computer Consultants |
| Dumoulen | Montréal | Answering Machines & Equipment |
| Dumoulin Bicyclettes | Villeray | Tout Commerces au détail |
| Dumoulin Groupe Electronique | Saint-Bruno | Business Centres |
| Dumoulin Pneus Et Mecanique Inc | Laval | Tire Shop |
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| Dunamis Maintenance | Montréal | Cleaning Services, Cleaning Service |
| Dundee Sustainable Technologies | Montréal | Life Sciences and Health Technologies (LSHT) |
| Dunkin'Donuts (Canada) Ltd Branches | Montréal | Bagels |
| Dunn's Famous | Montréal | Breakfast Restaurants |
| Dunns Famous | Centre-Ville | Tout Bars et restaurants |
| Dunsky Expertise en énergie | Montréal | Life Sciences and Health Technologies (LSHT) |
| Duo Bfb - Artistes De Cirque - Circus Artists | Montréal | Artists |
| DUO Centre Laval Quartier Laval | Laval-Des-Rapides | Tout Commerces au détail |
| Duo Chade | Montréal | Computer Graphics Design & Animation |
| Duochromatic | Montréal | Boutiques |
