Lake Murchison is a man-made water reservoir located in the western region of Tasmania, Australia.

The lake is situated within the northern part of Tasmania's West Coast Range and is fed by the Murchison River, the George Creek, the Anthony River, and discharge from the Tribute Power Station.

The dam created a 96,910-megalitre (3,422×10^6 cu ft) reservoir, called Lake Murchison, with a surface area ranging from 408 to 450 hectares (1,010 to 1,110 acres), drawn from a catchment area of 750 square kilometres (290 sq mi).

[1][3] Lake Murchison forms part of the Pieman River power development that was completed in the 1980s.

Downstream from Lake Murchison is Lake Mackintosh, Tullabardine Dam, Mackintosh Dam, Mackintosh Power Station, Lake Rosebery, Bastyan Dam, Bastyan Power Station, Lake Pieman, Reece Dam and the Reece Power Station.