| Sial | Ceramic Equipment & Supplies | — |
| SIB Electrique Inc | Generators | facebook.com |
| Siberian Touch Cattery | Animal Breeders | — |
| Silhouet-Tone Ltée | Tout Entreprises et services | silhouettone.com |
| Silhouette Esthetique | Health and Beauty | facebook.com |
| Silviu Jurcovan - Notaire | Commissioners for Oaths | jurcovan.com |
| Simcha Skull Cap | Cloth & Leather Caps | facebook.com |
| SIMGRAPH INC. | Aerospace | simgraph.com |
| Simple Vitality - Dre Marie-Claude Poirier, Chir opraticienne | Chiropractors | — |
| Sir-Wilfrid-Laurier School Board | Tout Enseignement et savoir | swlauriersb.qc.ca |
| Siriz Solutions | Computer Cabling, Installation & Service | facebook.com |
| Siu Keung Yu | yu | — |
| Skotinioton AGIA MARINA, Greek-Can. Association | Blue Pages | — |
| Sky Shelves | Furniture Stores | — |
| Slimwave With Veronica | Beauty & Fitness, Hairdressers & Beauty Salons | — |
| Smiths Detection Montréal Inc | Life Sciences and Health Technologies (LSHT) | smithsdetection.com |
| Sobio Pharmaceutique Canada Inc | Pharmacy | facebook.com |
| SOCIAL SERVICES/Laval Hellenic Community | Blue Pages | — |
| Société De Gestion Médicale Samson Inc | Medical Clinics | centremedicalsamson.ca |
| Société littéraire de Laval | Tout Arts et divertissement | entrevous.ca |
| Sofinecouture | Clothing Alterations | instagram.com |
| Soins Eurêka | Computer Graphics Design & Animation | eurekasoins.com |
| Solicom Canada | Advertising Agencies | solicomcanada.com |
| Solido - Vitres D'Autos , Auto Glass | Auto Glass & Windshields | — |
| Solution Air Frais | Home Improvement | — |
| Solution Air Inc | Building Repair & Restoration | facebook.com |
| Solution De Cablage Ssc | Computer Cabling, Installation & Service | — |
| Solutions Comptable MTL Inc | Accountants, Bookkeeping Software & Accounting Systems | montrealaccountingservices.com |
| Solutions Golf Tee You Off Inc | Shopping Mall | facebook.com |
| Solutions ISG | Computer Consultants | isg.ca |
| Sommex Communication | Computer Data Processing | sommex.com |
| Song Heng Te | te | — |
| Sonorisation Holiday | Audiovisual Equipment & Supplies Rental | sonorisationholiday.com |
| Soroc Technologie | Information Technologies (IT) | soroc.com |
| Sos e Commerce | Computer Accessories & Supplies | facebook.com |
| Soumissions Laval | Tout Entreprises et services | soumissionslaval.ca |
| Spa Adelina | Health and Beauty | facebook.com |
| Spa Crescent | Health and Beauty | spacrescent.com |
| Spa Divine Beauty | Health and Beauty | facebook.com |
| Spa M | Health and Beauty | mspalaval.ca |
| SPA Vitis Medica | Medical Clinics | facebook.com |
| Spa Vogue | Health and Beauty | spavogue.ca |
| Sphyr Communications | Tout Informatique et internet | sphyr.com |
| Sphère Transport International | Car & Truck Transporting Companies | facebook.com |
| SPI Sécurité Inc. | Tout Entreprises et services | spi.com |
| Spiro Méga Inc. | Tout Entreprises et services | spiromega.qc.ca |
| SplashGrafix inc. | Tout Informatique et internet | splashgrafix.com |
| Sport Addict : Centre d'Entraînement et d'Arts Martiaux | Arenas, Stadiums & Athletic Fields | facebook.com |
| Sport Physio Rive-Sud Inc | Physiotherapy | desmair.com |
| Sports Laval | Tout Arts et divertissement | sportslaval.qc.ca |
