In response to a dispute over wheat production quotas, Leonard Casley declared his 75 km2 (29 sq mi) farm in Western Australia to be an independent country as the Hutt River Province.

Western Australia (WA) is the westernmost state of Australia. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to the south, the Northern Territory to the north-east, and South Australia to the south-east. Western Australia is Australia's largest state, with a land area of 2,527,013 square kilometres (975,685 sq mi), and is also the second-largest subdivision of any country on Earth.

The Principality of Hutt River, often referred to by its former name, the Hutt River Province, was a micronation in Australia, proclaimed on 21 April 1970 when farmer Leonard Casley declared his farm to be a sovereign state, the "Hutt River Province". He claimed to have seceded from Australia, which occurred during his dispute with the authorities concerning wheat production quotas. A few years later, Casley began styling himself as "Prince Leonard" and granting family members royal titles, although he did not include the word "principality" in the official name until 2006. In 2017, Casley's claim to rulership was taken over by his son Graeme, who dropped the claim to sovereignty on 3 August 2020.