The First Menzies ministry was the 25th ministry of the Government of Australia. It was led by the country's 12th Prime Minister, Robert Menzies. The First Menzies ministry succeeded the Page ministry, which dissolved on 26 April 1939 following the election of Menzies as UAP leader after the death of former Prime Minister Joseph Lyons. However, due to the Country Party withdrawing from the Coalition after relations between caretaker Prime Minister Sir Earle Page and Menzies broke down, the First Menzies ministry was composed solely of UAP ministers, and was effectively a minority government. The ministry was replaced by the Second Menzies ministry on 14 March 1940 after Menzies took the Country Party back into his government - now led by Archie Cameron.

James Valentine Fairbairn was an Australian aviator and politician. A World War I fighter pilot, he represented the United Australia Party (UAP) in federal parliament and served as Minister for Air and Civil Aviation from 1939 until his death the following year.