Muswellbrook is a town in the Upper Hunter Region of New South Wales, Australia, about 243 km (151 mi) north of Sydney and 127 km (79 mi) north-west of Newcastle.
Muswellbrook had an estimated urban population of 12,868 as at June 2015. Geologically, Muswellbrook is situated in the northern parts of the Sydney basin, bordering the New England region.
The area is predominantly known for coal mining and horse breeding, but has also developed a reputation for gourmet food and wine production. Located to the south of the Muswellbrook township are two coal fuelled power stations, Liddell and Bayswater. They were commissioned in 1973 and mid 1980s respectively and employ approximately 500 people from the area.