The Shire of Esk was a local government area in South East Queensland, Australia, located about 90 kilometres (56 mi) west - northwest of Brisbane. It stretched from the Lockyer Valley north and west to the Great Dividing Range and up the valley of the Brisbane River. Esk covered an area of 3,936.2 square kilometres (1,519.8 sq mi), and existed from 1879 until its merger with the Shire of Kilcoy to form the Somerset Region on 15 March 2008.

The Somerset Region is a local government area located in the West Moreton region of South East Queensland, Australia, about 100 kilometres (62 mi) northwest of Brisbane and centred on the town of Esk. It was created in 2008 from a merger of the Shire of Esk and the Shire of Kilcoy. It is commonly known as the Brisbane Valley, due to the Brisbane River which courses through the region, although significant parts of the region lie outside the hydrological Brisbane Valley itself.