| Lexum | Montréal | Not Profit, library |
| Librairie Coopérative du Collège de Maisonneuve | Montréal | Not Profit, library |
| Librairie De La Montée | Saint-Hubert | Book Stores, Not Profit, library, Library |
| Librairie Les Bons Débarras | Verdun | Not Profit, library |
| Library | Châteauguay | Not Profit, library |
| Limousine Murray Hill Inc | Dorval | Chauffeur Services |
| LISI Aerospace | Dorval | Tout Entreprises et services |
| Lisi Aerospace Canada Corp | Dorval | Aviation Consultants & Services |
| LISI AEROSPACE CANADA CORPORATION | Dorval | Aerospace |
| List Transport Inc. | Dorval | Tout Entreprises et services |
Publicité (Desktop) Publicité (Mobile) |
| Location Brossard | Dorval | Tout Commerces au détail |
| Loisirs-culture et vie communautaire | Saint-Lambert | Not Profit, library, Library |
| Loisirs-culture et vie communautaire | Saint-Lambert | Not Profit, library, Library |
| LOISIRS-CULTURE ET VIE COMMUNAUTAIRE | Brossard | Not Profit, library, Library |
| Loisirs-culture-activités communautaires | Mont-Royal | Not Profit, library |
| LSI Canada Inc. | Dorval | Tout Entreprises et services |
| LSI LUMINESCENT SYSTEMS CANADA INC. (ASTRONICS) | Dorval | Aerospace |
| Lutek Équipement Plastique Inc. | Dorval | Tout Entreprises et services |
| Lyskaam Coatings Inc | Dorval | Painters |
| Léon | Dorval | Furniture Stores |
Publicité (Desktop) Publicité (Mobile) |
| M R Mécanique | Lachine | Auto Repair Garages, Automobiles, Not Profit, Car Repair |
| M.R. Continent Globe Corporation | Dorval | Life Sciences and Health Technologies (LSHT) |
| Manoir Kanisha | Dorval | Tout Entreprises et services |
| Manoir Kanisha Inc. | Dorval | Tout Commerces au détail |
| Mapp Inspection Inc | Dorval | Analytical & Testing Laboratories |
| Marché Ami | Lemoyne | Not Profit, Grocery Stores |
| Marché D Alimentation Ontario Inc. | Montréal | Not Profit, Grocery Stores |
| Marché Murugan Inc | Montréal | Automobiles, Not Profit, Grocery Stores |
| Marché Royal Plus | Montréal | Automobiles, Not Profit, Grocery Stores |
| Marché Ville Mont-Royal Inc. | Mont-Royal | Not Profit, Grocery Stores |
Publicité (Desktop) Publicité (Mobile) |
| Mariana Coiffure Beauté | Dorval | Black Hair Salons |
| Marie-Pierre Ayoul Decorative Painting | Dorval | Painters |
| Marshall Equipment | Dorval | Clothes Lines |
| Martineau, groupe immobilier | Dorval | Tout Entreprises et services |
| Marvin Duchow Music Library, McGill University | Montréal | Not Profit, library |
| Matrox | Dorval | Tout Informatique et internet |
| McGill University Libraries | Centre-Ville | Tout Enseignement et savoir |
| McLennan Library Building | Montréal | Not Profit, library |
| MD Climatisation | Dorval | Air Conditioning Contractors |
| Meca Mobile | Montréal | Auto Repair Garages, Not Profit, Car Repair |
Publicité (Desktop) Publicité (Mobile) |
| Mecanique Auto Elite | Montréal | Auto Repair Garages, Automobiles, Not Profit, Car Repair |
| Mediatheque littéraire Gaetan Dostie | Montréal | Not Profit, library |
| Medica-Radiologie Ellendale | Montréal | Not Profit, Medical Clinics |
| Members of Parliament | Montréal | Not Profit, library |
| Menlo Worldwide Forwarding | Dorval | Airlines |
| Menzies Aviation (Canada) Ltd | Dorval | Aviation Consultants & Services |
| Mercier Hochelaga-Hochelaga-Maisonneuve | Montréal | Not Profit, library |
| MERCIER-HOCHELAGA-MAISONNEUVE | Montréal | Not Profit, City Halls, library |
| Mercier-Hochelaga-Maisonneuve | Montréal | Not Profit, library |
| Mercier-Hochelaga-Maisonneuve | Montréal | Not Profit, library |
