The Fourth Lyons Ministry was the twenty-fourth Australian Commonwealth ministry, and ran from 29 November 1937 to 7 April 1939. United Australia Party–Australian Country Party Coalition * Rt Hon Joseph Lyons, MP: Prime Minister (UAP) * Rt Hon Sir Earle Page, GCMG MP: Minister for Commerce. Minister for Health (to 7 November 1938) (CP) * Hon Robert Menzies, KC MP: Attorney-General, Minister for Industry (to 20 March 1939) (UAP) * Senator Hon Alexander McLachlan: Postmaster-General (to 7 November 1938) (UAP) * Hon Thomas White, MP: Minister for Trade and Customs (to 8 November 1938) (UAP) * Hon Richard Casey, MP: Treasurer. Minister in charge of Development and Scientific and Industrial Research (to 7 November 1938) (UAP) * Rt Hon Billy Hughes, KC MP: Minister for External Affairs. V