John Joseph Daly (10 November 1891 – 13 April 1942) was an Australian lawyer and politician who served as a Senator for South Australia from 1928 to 1935.

During the Scullin government he was the party's Senate leader, and held ministerial office as Vice-President of the Executive Council and briefly as Minister for Defence.

He continued his education at Remington Training College and became an office-boy in the legal firm of Sir Josiah Symon and later conveyancing clerk for William Joseph Denny and Francis Villeneuve Smith.

From August 1930 to January 1931, he acted as Attorney-General and allegedly had H. V. Evatt and Edward McTiernan appointed to the High Court of Australia against Scullin's wishes.

He was expelled from the party by the South Australian branch for supporting Scullin's economic policies and failed to gain preselection for the Senate for the 1934 election.