John Willcock, Australian politician, 15th Premier of Western Australia, (died 1956)

John Collings Willcock was an Australian politician. He was the premier of Western Australia from 1936 to 1945, holding office as state leader of the Australian Labor Party (ALP). He was a member of the Western Australian Legislative Assembly from 1917 to 1947, representing the seat of Geraldton. Prior to entering politics he was a railways worker and train driver.

The premier of Western Australia is the head of government of the state of Western Australia. The role of premier at a state level is similar to the role of the prime minister of Australia at a federal level. The premier leads the executive branch of the Government of Western Australia and is accountable to the Parliament of Western Australia. The premier is appointed by the governor of Western Australia. By convention, the governor appoints as premier whoever has the support of the majority of the Western Australian Legislative Assembly, the lower house of the Parliament of Western Australia. In practice, this means that the premier is the leader of the political party or group of parties with a majority of seats in the Legislative Assembly. Since Western Australia achieved self-governance in 1890, there have been 31 premiers. Roger Cook is the current premier, having been appointed to the position on 8 June 2023.