Killarney is a municipality located on the northern shore of Georgian Bay in the Sudbury District of Ontario, Canada. Killarney is commonly associated with Killarney Provincial Park, which is a large wilderness park located to the east of the townsite which occupies much of the municipality's expanded boundary. In addition to the community of Killarney itself, the communities of Hartley Bay and Bigwood, and the ghost towns of French River, Collins Inlet and Key Harbour, are also located within the municipal boundaries. The eastern end of the La Cloche Mountain Range is also located within the municipality of Killarney.

Manitoulin District is a district in Northeastern Ontario within the Canadian province of Ontario. It was created in 1888 from part of the Algoma District. The district seat is in Gore Bay.