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- Saugeen First Nation Public Library
- Sault Ste. Marie Public Library
- Schreiber Township Public Library
- Scugog Memorial Public Library
- County of Simcoe Library Co-op
- Sault Ste. Marie Public Library
- Schreiber Public Library
- Severn Township Public Library
- Shelburne Public Library
- Sioux Lookout Public Library
- Simcoe Library Cooperative
- Six Nations Public Library
- Smith-Ennismore-Lakefield Public Library
- Smiths Falls Public Library
- Springwater Township Public Library
- St. Catharines Public Library
- St. Marys Public Library
- St. Thomas Public Library
- Stirling-Rawdon Public Library
- Stormont, Dundas & Glengarry County Library
- Stratford Public Library
Read more about this topic: List Of Public Libraries In Ontario