The Shire of Toodyay is a local government area in the Wheatbelt region of Western Australia, beyond the north-eastern limits of the Perth metropolitan area. The Shire covers an area of 1,694 square kilometres (654 sq mi), and its seat of government is the town of Toodyay.

The Wheatbelt is one of nine regions of Western Australia defined as administrative areas for the state's regional development, and a vernacular term for the area converted to agriculture during colonisation. It partially surrounds the Perth metropolitan area, extending north from Perth to the Mid West region, and east to the Goldfields–Esperance region. It is bordered to the south by the South West and Great Southern regions, and to the west by the Indian Ocean, the Perth metropolitan area, and the Peel region. Altogether, it has an area of 154,862 square kilometres (59,793 sq mi).