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- Caldwell First Nation Public Library
- Caledon Public Library
- Callander Public Library
- Cambridge Public Library (Ontario)
- Carleton Place Public Library
- Carlow-Mayo Public Library
- Casselman Public Library
- Cavan, Millbrook, North Monaghan Library
- Central Manitoulin Public Library
- Champlain Township Public Library
- Chapleau Public Library
- Chatham-Kent Public Library
- Chippewas of Georgina Island First Nation Library
- Chippewas of Kettle and Stony Point First Nation Public Library
- Chippewas of the Thames Library & Resource Center 1
- Clarington Public Library
- Clarence-Rockland Public Library
- Clearview Public Library
- Cobalt Public Library
- Cobourg Public Library
- Collingwood Public Library
- Conmee Public Library
- Cornwall Public Library
- County of Prince Edward Public Library
- Cramahe Township Public Library
- Curve Lake First Nation Public Library
Read more about this topic: List Of Public Libraries In Ontario