Sir Michael Neil O'Sullivan KBE (2 August 1900 – 4 July 1968) was an Australian politician and lawyer. He served as a Senator for Queensland from 1947 to 1962, representing the Liberal Party. He held senior ministerial positions in the post-war Menzies Government, serving as Minister for Trade and Customs (1949–56), Minister for the Navy (1956), and Attorney-General (1956–58).