The 1931 Australian federal election was held in Australia on 19 December 1931. All 75 seats in the House of Representatives and 18 of the 36 seats in the Senate were up for election. The incumbent first-term Australian Labor Party (ALP) government led by Prime Minister James Scullin was defeated in a landslide by the United Australia Party (UAP) led by Joseph Lyons. To date, this is the last time that a sitting government at federal level has been defeated after a single term. Labor spent the next 10 years in opposition; it did not return to power until 1941.