The McLarty–Watts Ministry was the 21st Ministry of the Government of Western Australia, led by Liberal Premier Sir Ross McLarty and his deputy, Country Party leader Arthur Watts. It succeeded the Wise Ministry on 1 April 1947, following the defeat of the Labor government at the 1947 election two weeks earlier. It was significant in that it included in Florence Cardell-Oliver not only the oldest person, at age 70, to receive their first appointment to a ministerial post in Western Australia, but also the first female cabinet minister in Australia.