The Cahill ministry (1959) or Fourth Cahill ministry was the 58th ministry of the New South Wales Government, and was led by the 29th Premier, Joe Cahill, of the Labor Party. The ministry was the fourth and final of four consecutive occasions when the Government was led by Cahill, as Premier. This ministry covers the period from 1 April when Cahill won the 1959 state election, until 28 October 1959. On 22 October 1959 Cahill, a heavy smoker, died at Sydney Hospital of a myocardial infarction while still serving as Premier. Cahill's deputy, Bob Heffron succeeded Cahill as Premier.