| Bizware Software Solutions | Information Technologies (IT) | datamaxgroup.com |
| Bjac | Aircraft Parts, Engines & Avionics | — |
| BK CPA Inc | Accountants | facebook.com |
| Bk Entretien / Débouchage Et Inspection De Drain | Plumbing | — |
| BKB Spa | Health and Beauty | — |
| BKIND | Tout Commerces au détail | fr.bkind.com |
| Bl Solutions Montreal | Cleaning Services, Cleaning Service | litroncanada.com |
| Black & MacDonald Limited | Life Sciences and Health Technologies (LSHT) | blackandmcdonald.com |
| Black & Mc Donald Ltée | HVAC | blackandmcdonald.com |
| Black & McDonald Limited | Tout Entreprises et services | blackandmcdonald.com |
| Black & McDonald Ltd | Air Conditioning Repair & Cleaning | blackandmcdonald.com |
| Black Diamond Estates Inc | Accountants, Accounting Services | blackdiamondestates.ca |
| Black Fashion Beauty Canada | Health and Beauty | blackfashionbeauty.ca |
| Black Horse Pavage | Animal Breeders | — |
| Black Moonshine Oddities | Antique Dealers | facebook.com |
| Black Touch Salon de Coiffure | Black Hair Salons | blacktouchsalondecoiffure.placeweb.site |
| Black's | Tout Commerces au détail, Camera & Photo Equipment Stores | blacks.ca |
| Blackboard Pictures | Chalkboards | — |
| Blackbox | Fitness Gyms | — |
| BlackCat SEO Montréal | Tout Informatique et internet | blackcatseo.ca |
| BlackMontreal.com | Tout Communautés et société | blackmontreal.com |
| Blain Daniel | Pharmacy | — |
| Blairco Transportation | Cemeteries | — |
| Blaise Laplante, Cpa | Accounting Services | facebook.com |
| Blanca Canada | Home Improvement | — |
| Blanchard Hélène | Business & Trade Organizations | facebook.com |
| Blanchette Décor Inc | Painters | — |
| Blanchette Transport Enrg | Bus & Coach Rental & Charter | facebook.com |
| Blandine Coiffure | Beauty & Fitness, Hairdressers & Beauty Salons | facebook.com |
| Blanshay Sidney Dr | Dentists | — |
| Blast-O-Soda Inc | Cleaning Services, Cleaning Service | facebook.com |
| Blazysgerard Inc | Architectural Drawing | blazysgerard.com |
| Blended Productions | Artists | — |
| Bleu & Persillé | Tout Commerces au détail | bleuetpersille.ca |
| Blockstream | Information Technologies (IT) | blockstream.com |
| Blog des Archives de Montréal | Tout Informations générales | archivesdemontreal.wordpress.com |
| Blondedy Ferdinand Studio Canada | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Bloom Beauty Bar Inc | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Bloom Paysagement | Landscaping | — |
| Bloom Search Marketing | Advertising Agencies | makeitbloom.com |
| Bloom's Cleaning | Carpet & Rug Cleaning | — |
| Bloomberg Morton J Dr | Chiropractors | — |
| Bloomchat | Information Technologies (IT) | bloomchat.co |
| Bloomex | Baskets, Tout Commerces au détail | bloomex.ca |
| Bloquesa | Home Improvement | — |
| Blue Bug Entertainment | Information Technologies (IT) | bluebugentertainment.com |
| Blue Lizard Games | Information Technologies (IT) | bluelizardgames.com |
| Blue Sky Technologies | Boutiques | facebook.com |
| Blue Spirit Productions | Information Technologies (IT) | spirit-prod.com |
| Blue Water Québec Ltd | Life Sciences and Health Technologies (LSHT) | bluewateragencies.ca |
