Lake Rosebery is a man-made water reservoir located in the West Coast region of Tasmania, Australia. The lake is situated within the northern part of Tasmania's West Coast Range and is fed by the dammed Mackintosh and Murchison rivers.

The Bastyan Dam across the Pieman River was built by the Hydro-Electric Commission in 1983. The dam created a 123,520-megalitre (4,362×10^ cu ft) reservoir, called Lake Rosebery, with a surface area ranging from 744 hectares (1,840 acres), drawn from a catchment area of 1,397 square kilometres (539 sq mi).

The lake is located near the village of Tullah.

The diverted Emu Bay Railway line and the Wee Georgie Wood Railway line run close to the lake.

• List of reservoirs and dams in Tasmania
• List of lakes in Tasmania
• List of power stations in Tasmania

• Hepper, Marriott & Associates (1984). Lake Rosebery recreation development plan. Hobart: Hepper, Marriott. ISBN 1-86252-515-3.
• "Pieman Sustainability Review: Information review of the Anthony-Pieman hydropower scheme" (PDF). Hydro Tasmania. February 2015. Archived from the original (PDF) on 6 July 2015. Retrieved 4 July 2015.

• "Tullah, Tasmania". Western Wilderness. West Coast Council. 2018.
• "Lake Roseberry". Inland Fisheries Service