Rock Lake Campground B is the smaller of two drive-in campground sections at Rock Lake in Algonquin Provincial Park, situated down a separate access road with its entrance just before the Booth's Rock Trail parking lot.

All sites are non-electric, and roughly half sit directly on the waterfront, with some offering notably scenic views of the lake.

Sites are more spread out than in the adjacent Campground A, lending a bit more privacy, though the campground is still fairly compact. Each site includes a fire ring and picnic table.

Larger RVs, trailers, and fifth wheels over 18 feet will find very limited options, with only a handful of sites accommodating up to 25 feet.