The Cahill ministry (1956–1959) or Third Cahill ministry was the 57th ministry of the New South Wales Government, and was led by the 29th Premier, Joe Cahill, of the Labor Party. The ministry was the third of four consecutive occasions when the Government was led by Cahill, as Premier. This ministry covers the period from 15 March 1956 when Cahill won the 1956 state election, until 1 April 1959, when Cahill led Labor to victory at the 1959 state election and the Fourth Cahill ministry was formed.