Lake Lenthall is a lake created by the Lenthalls Dam in Duckinwilla, Fraser Coast Region, Queensland, Australia. As a result of a 518 square kilometres (200 sq mi) catchment, it takes a short time in moderate rain events to fill Lake Lenthall to 100% capacity.

The dam and lake were named after the pioneering family in the district. The dam was constructed in 1984 on the head waters of the Burrum River and raised by 2 metres (6 ft 7 in) in 2007. In January 2013 due to heavy rain from ex Tropical Cyclone Oswald, the lake reached its highest recorded level of 30.4 metres (100 ft) which was 4.4 metres (14 ft) over the spillway.

The lake has a relatively small surface area of 766 hectares (1,890 acres), an average depth of 4 to 5 metres (13 to 16 ft). Its main purpose is to supply for town water for Hervey Bay and surrounding townships within the Fraser Coast Region.

It is stocked with Australian native fish such as barramundi, bass, golden perch and silver perch under the Queensland Governments stocked impoundment permit scheme. Other aquatic species which inhabit the lake include spangled grunter, saratoga, Krefft's turtle, Flinders Ranges mogurnda, rainbow fish, fire tail gudgeon, long finned eel and many more. The lake is home to a myriad of reptiles, insects, bird life and mammals.

A Stocked Impoundment Permit is required to fish in the dam.

A significant black-breasted buttonquails reside within the dry vine rain forests on the ridges overlooking Lake Lenthall.

• List of dams and reservoirs in Australia

• Lenthalls Dam / Lake Lenthall Fishing & Boating Information