Big Salmon 4 Camp is a cluster of four backcountry campsites situated roughly halfway along the south shore of Big Salmon Lake in Frontenac Provincial Park, Ontario.

The shoreline here is notably sandy with a shallow bottom, offering a gentler setting compared to the rockier shores elsewhere on the lake. A sandy bay good for swimming lies about half a kilometre to the east.

The cluster can be reached by hiking approximately 2 hours from the Big Salmon Lake parking lot or 3 hours from the Park Office. By canoe or kayak, the paddle takes 1 to 1. 5 hours from the lake's dock with no portages required.

Only small electric motors are permitted on Big Salmon Lake, keeping the water quiet. In season, anglers can fish for lake trout and bass.

Individual sites within the cluster feature wooden tent platforms, food lockers, and varying degrees of shade and privacy.