Sir James Mitchell, was an Australian politician. He served as premier of Western Australia from 1919 to 1924 and from 1930 to 1933, as leader of the Nationalist Party. He then held viceregal office from 1933 to 1951, as acting governor from 1933 to 1948 and governor of Western Australia from 1948 until his death in 1951.

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.