Rock Lake Campground A is one of two sections of Rock Lake Campground, a medium-sized drive-in campground located in Algonquin Provincial Park, Ontario. It sits roughly 8 km south of Highway 60 along a gravel road and is operated by Ontario Parks.

Campground A is the larger and more developed of the two sections, containing all of the electrical sites and the campground's main beach.

It is also closest to the primary comfort station and campground office at the campground entrance, which offer flush toilets and showers. A second beach is within short walking distance as well.

The surrounding area offers strong recreational opportunities, including motorboat access on Rock Lake (with a 20-horsepower limit), canoeing, kayaking, and the 5.

1 km Booth's Rock Trail, which takes in lake views and a lookout over an abandoned railway corridor.