Big Salmon Lake is a lake in Frontenac Provincial Park in eastern Ontario.

It lies in the Frontenac Axis and is the largest lake in the park.

It is a long, narrow shaped lake, accessible by the main road into the park and by many hiking trails.

A notable one of these islands is Devil's Oven, named by homesteaders for a hollowed rock formation resembling an oven.

This Eastern Ontario geographical article is a stub.