The King River is a river in the Great Southern region of Western Australia. The river rises east of the town of Redmond. The river flows for approximately 27 kilometres (17 mi) and along with the Kalgan River drains into Oyster Harbour and finally King George Sound north east of Albany.
The river was named after Captain Phillip Parker King RN (1791-1856) by Dr Thomas Braidwood Wilson while exploring the region in December 1829. The estuarine zone of the river is from the mouth to 7 kilometres (4 mi) upstream to where Mill Brook joins the river. The land along the river is estimated as being 83% cleared yet the water quality is generally healthy fresh water. The salinity level of the King River at discharge is 800mg/L.