Dublin
- S1 Ireland Ltd
- Saba
- Sabeo Technologies Ltd
- Sabre Electrical Services Ltd
- Sach Central Vacuum Systems
- Sacs
- Safeair Systems
- Safenet Systems
- Safety Kleen Ireland Ltd
- Saffron Pictures
- Salient Consultancy Services
- Sallynoggin Library
- Sally's Salon Services
- Salsa Liberte
- Samantha Rawson Cert AAB
- Sam's Beauty Room
- Samuels P A The Watch Shop
- Sandford Freight Ltd
- Sandycove Veterinary Clinic
- Sandyford Glazing (Arnold Stanley)
