Donald Robert Willesee was an Australian politician. He was a member of the Australian Labor Party (ALP) and served as a Senator for Western Australia from 1950 to 1975. He held ministerial office in the Whitlam government as Special Minister of State (1972–1973) and Minister for Foreign Affairs (1973–1975). He also served as Leader of the Opposition in the Senate from 1966 to 1967.

The Special Minister of State (SMOS) in the Government of the Commonwealth of Australia is a position currently held by Don Farrell since 1 June 2022, following the Australian federal election in 2022. The minister is responsible for various parliamentary, electoral, financial, public service, and oversight affairs.