Thomas Joseph Shuldham O'Halloran, SM (27 April 1835 – 9 January 1922) was a magistrate in the colony and State of South Australia, a service of 45 years. At the time of his death he was the oldest Stipendiary Magistrate in Australia.He was a son of Major T. S. O'Halloran and father of T. S. O'Halloran, KC.