Dumbleyung is a town and shire in the Wheatbelt region of Western Australia, 267 kilometres (166 mi) south-east of Perth between Wagin and Lake Grace on State Route 107.

Dumbleyung's name is of Noongar origin, coming from "Dambeling" which possibly means "large lake or inland sea" (although another source suggests it came from "dumbung", a game played with bent sticks and a hard piece of fruit.

[3] Pastoralists and sandalwood cutters moved into the area, initially settling at Nippering, north of Lake Dumbleyung and 10 kilometres (6 mi) west of the present town.

The lake is famous for Donald Campbell breaking the world water speed record there in 1964 in his boat, Bluebird.

Dumbleyung itself is a service centre with a post office, school, tavern, public library, caravan park and other facilities.