The first Whitlam Ministry (Labor) was the 47th ministry of the Government of Australia. Often known as the "two-man Ministry" or the "Duumvirate", it was led by the country's 21st Prime Minister, Gough Whitlam. The first Whitlam ministry succeeded the McMahon Ministry, which dissolved on 5 December 1972 following the federal election that took place on 2 December which saw Labor defeat William McMahon's Liberal–Country Coalition. The ministry was replaced by the second Whitlam ministry on 19 December 1972.

Diarchy, duarchy, or duumvirate is a form of government characterized by corule, with two people ruling a polity together either lawfully or de facto, by collusion and force. The leaders of such a system are usually known as corulers.