The Shire of Plantagenet is a local government area in the Great Southern region of Western Australia, managed from the town of Mount Barker, 360 kilometres (224 mi) south of Perth and 50 kilometres (31 mi) north of Albany. The shire covers an area of 4,792 square kilometres (1,850 sq mi) and includes the communities of Narrikup, Rocky Gully, Kendenup and Porongurup.
The region is noted for agriculture, principally wheat, sheep (wool and meat), beef cattle, wine, canola and olives. Silviculture, especially plantations of Tasmanian Blue Gums (Eucalyptus globulus), was a major industry in the shire although some recent silviculture enterprises (Great Southern Plantations and Timbercorp) have gone into receivership. Local tourist attractions include the Porongurup Range and Stirling Range, a museum based within the original police station, and other pioneer structures such as St Werburghs Chapel.