The rock monitor (Varanus albigularis), also called the legavaan or white-throated monitor, is a species of monitor lizard found in southern Africa. It is the second longest lizard found on the continent of Africa and the heaviest bodied.

The heaviest bodied and second longest lizard (the Nile monitor is longer) in Africa, they reach upwards of 2 meters (6 ft 7 in) in length, with the tail and body being of equal size. The head and neck are the same length, and are distinct from each other. Their bulbous, convex snouts give an angular, box-like appearance. Their forked tongues are pink or bluish, and their scales are usually a mottled gray-brown with yellowish or white markings.