| Di Feo R | Saint-Léonard | Landscaping |
| Di Hu | Mirabel | hu |
| Di La | Québec | di |
| Di Lonardo Arturo et Fils Paysagistes & Déneigement | Montréal | Landscaping |
| Di Nolfo Charles Dr | Montréal | Dentists |
| Di Sl | Chomedey | sl |
| Di Tullio & Hermanovitch-Cadot | Montréal | Commissioners for Oaths |
| Di Villadorata Massimo | Montréal | Acupuncturists |
| Di Vita F Inc | Lasalle | Bakery Supplies |
| Di Zazzo Aluminium | Montréal | Home Improvement |
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| Diabete Quebec | Montréal | Associations |
| Diablos BBQ | Montréal | Tout Bars et restaurants |
| Diabo Auto Wholesale | Kahnawake | Tire Shop |
| DIACARB INC. (OUTILS) | Montréal | Aerospace |
| Diacarb Usinage | Montréal | Tout Entreprises et services |
| Diagnos | Québec | Life Sciences and Health Technologies (LSHT) |
| Diagnos Inc. | Taschereau | Life Sciences and Health Technologies (LSHT) |
| Diagnostic IRM Inc | Montréal | Medical Clinics |
| Diagram Ventures | Montréal | Startup Ecosystem |
| Diagramme - gestion culturelle | Quartier Latin Et Centre-Sud | Tout Entreprises et services |
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| Dialog Insight | Montréal | Information Technologies (IT) |
| Dialogic Corporation | Longueuil | Information Technologies (IT), Tout Informatique et internet |
| Diamancel Products Inc. | Montréal | Tout Entreprises et services |
| Diamancy | Montréal | Cleaning Services, Cleaning Service |
| Diamant Esthetique | Dollard Des Ormeaux | Beauty & Fitness, Hairdressers & Beauty Salons |
| DiaMentis | Montréal | Life Sciences and Health Technologies (LSHT) |
| Diamond Auto Detailing | Laval | Car Detailing |
| Diamond Cleaning Services | Montréal | Cleaning Services, Cleaning Service |
| Diamond Diamond Real Estate Inc. | Montréal | Tout Entreprises et services |
| Diamond Insulating Ltd | Montréal | Cold & Heat Insulation Contractors |
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| Diamond Lave Auto à la Main | Dollard Des Ormeaux | Car Detailing |
| Diamond Nails | Montréal | Beauty & Fitness, Hairdressers & Beauty Salons |
| Diamond Tool Products | Ville-Mont-Royal | Tout Entreprises et services |
| Diamonds & Pearls Nails And Lash Lift By D | Montréal | Beauty & Fitness, Hairdressers & Beauty Salons |
| Diana Beauty Salon | Montréal | Beauty & Fitness, Hairdressers & Beauty Salons |
| Diane Beauchamp Massotherapeute | Longueuil | Massage Therapy |
| Diane Bérubé | Pont-Viau | Tout Arts et divertissement |
| Diane Caron | Montréal | Tout Arts et divertissement |
| Diane Couture | Laval | Couture, COUTURE |
| Diane Couture | Carignan | Couture, COUTURE |
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| Diane Couture | Candiac | Couture, COUTURE |
| Diane De Montigny | Québec | qe |
| Diane Ferland Artiste Coiffeuse | Laval | Beauty & Fitness, Hairdressers & Beauty Salons |
| Diane Gagnon Esthvâticienne | Terrebonne | Beauty & Fitness, Hairdressers & Beauty Salons |
| Diane Laflamme - Illustratrice - Caricaturiste | Montréal | Commercial Artists |
| Diane Michaud Conseillère d'Orientation | Montréal | Career Counselling |
| Diane Roy - Élevage de Chiens | Saint-Mathieu-De-Laprairie | Animal Breeders |
| Diane Silver Linings | Greenfield Park | Arts & Crafts Supplies, Arts & Crafts Materials & Supplies |
| Dianova | Montréal | Apartment Hotels |
| Diapason FG Inc | La Prairie | Advertising Agencies |
