| Barbara - Accompagnante aux cycles de vie / Doula & Photographe | Artists | — |
| Barbeau Hélène | Boutiques | barbeauboutique.blogspot.ca |
| Barbie's Bar&Grill | Tout Bars et restaurants | barbiesgrill.com |
| Barbier EL Maestro | Barbers, Men's Hairdressers & Barber Shops | facebook.com |
| Bare Distribution | Clothing Manufacturers & Wholesalers | facebook.com |
| Bare Montreal | Cleaning Services, Cleaning Service | baremontreal.info |
| Barer Cie. D'ingénierie | Tout Entreprises et services | barer.com |
| Baril Design | Bathroom Accessories | barildesign.com |
| Baril et fils | Home Improvement | — |
| Barin S E N C R L | Architects | barin.ca |
| Barnaque | Information Technologies (IT) | barnaque.com |
| Barnes, Denis Architecte | Architectural Technologists | facebook.com |
| Baron De Hirsch Cemeteries | Cemeteries | — |
| BaronHirsch Cemeteries | Cemeteries | — |
| BAROQUE Picture Frames Inc. | Home Decoration & Maintenance | encadrementbaroque.com |
| Barraca | Tout Bars et restaurants | barraca.ca |
| Barreau de Montréal | Tout Entreprises et services | barreaudemontreal.qc.ca |
| Barreau du Québec | Tout Entreprises et services, Business & Trade Organizations | barreau.qc.ca |
| Barrette Peinture | Painters | — |
| Barricades Mysterieuses | Antique Dealers | barricadesmysterieuses.com |
| Barroco Restaurant | Tout Bars et restaurants | barroco.ca |
| Barserie Capri | Bars | labarseriecapri.com |
| Barvi Inc | Home Improvement | — |
| Barza Bronfen | Business Lawyers | — |
| BAS Entretien Ménage | Cleaning Services, Cleaning Service | — |
| Basco Les Moulins | Home Improvement | — |
| Base Concept Inc | Beverage Dealers | baseconcept.com |
| Basel Dabbas D m d Inc | Dentists, Service D'urgence Dentaire | — |
| Bases de données sur le patrimoine de Montréal | Tout Arts et divertissement | patrimoine.ville.montreal.qc.ca |
| BASF Canada | Tout Entreprises et services | basf.com |
| Basha's Corner | Arts & Crafts Stores | — |
| Basseltex Inc | Bedding & Linens | — |
| Bastien Mario Plomberie Enr | Plumbing | facebook.com |
| Bastix Souvenir | Candles | — |
| Batalion, Dr Hyman | Health Services | facebook.com |
| Bateau A9 Unité Mobile | Boat Repair & Maintenance | bateaua9.com |
| Bateau mouche | Tout Tourisme et hôtels | bateaumouche.ca |
| Bath & Body Works | Beauty Institutes | bathandbodyworks.com |
| Bath Fitter | Bathroom Renovations | bainmagique.com |
| Batimmo | Appraisers | batimmo.ca |
| Baton Rouge Restaurant | Tout Bars et restaurants | batonrouge.ca |
| Bauhaus Realty Real Estate Services | Real Estate Offices, Courtier immobilier | — |
| Bayanemarket | Catalogue & Online Shopping | — |
| Bayard Canada | Tout Entreprises et services | bayardcanada.ca |
| Bayard jeunesse | Tout Commerces au détail, Tout Entreprises et services | bayardjeunesse.ca |
| Bayer Canada | Life Sciences and Health Technologies (LSHT) | bayer.ca |
| Baylis Medical Company Inc. | Tout Entreprises et services | bostonscientific.com |
| Baylis Médical Cie Inc. | Life Sciences and Health Technologies (LSHT) | baylismedical.com |
| Bayou-Design | Tout Entreprises et services | bayoudesignstudios.com |
| Bayshore Healthcare | Care Homes | — |
