Flat Rock 1 Camping is a free campground on the shores of Lake Lonsdale in Victoria, situated between Stawell and Halls Gap along the Western Highway, roughly two and a half to three hours west of Melbourne.

The lake sits within view of the Grampians, making it a scenic base for relaxing stays. The campground is accessed via an unsealed road off Sandbar Road, suitable for all vehicle types.

On-site facilities include drop toilets — one of which is wheelchair accessible — that are cleaned regularly, particularly during summer. The camping area is spacious, with room for many setups without feeling crowded.

A patrol officer visits daily, and waste facilities are maintained consistently. Lake Lonsdale offers swimming, boat fishing, and yabbying, with a boat ramp a short drive away.

Flat Rock is one of several campgrounds around the lake, alongside Flat Rock 2, Diggers Rest, Elliots, and others.