Michael Gene Brennan OAM (born 15 October 1975 in Toowoomba, Queensland) is a field hockey midfielder from Australia, who was a member of the team that won gold at the 2004 Summer Olympics in Athens. Four years earlier, when Sydney hosted the Summer Games, he finished in third spot with The Kookaburras , as the men's national team is called. Michael Brennan has since gone on to become a multiple Group 1 winning horse trainer.
In December 2023 Michael Brennan joined an elite group of athletes joining the Australian Hockey Hall Of Fame.