Brunswick River is a river in the South West region of Western Australia.
The Brunswick River has a catchment area of approximately 528km² and joins the Collie River about 6km upstream of the Leschenault Inlet. https://ceed.wa.edu.au/wp-content/uploads/2017/02/Annan-Dept-Water.pdf?
The river rises in the Darling Range then flows south-west discharging into the Collie River near Australind.
The river was named in 1830 by Lieutenant-Governor James Stirling after Ernest Augustus, King of Hanover, Duke of Brunswick and Lüneburg, the fifth son and eighth child of George III. Over a period of five days in December 1813, while in command of , Captain Stirling took the duke and his entourage to Wijk aan Zee in Holland.
The Brunswick has six tributaries: Wellesley River, Ernest River, Elvira Gully, Augustus River, Frederic River and Lunenburgh River.
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