The East Leichhardt Dam is a rock-filled embankment dam built across the East Leichhardt River, located at , east of Mount Isa, in north-western Queensland, Australia. Completed in 1961, the resultant reservoir, Lake Mary Kathleen, was built for the emergency supply of water for the now-closed Mary Kathleen uranium mine. However, Lake Corella was sufficient and the reservoir is now used for recreation purposes, located on private property.
Access to the dam is via the Barkly Highway, with the dam wall situated approximately south of the highway.
The dam is high, long, and holds back of water when at full capacity. The reservoir covers a surface area of that is drawn from a catchment area of .