Dermott Hugh Brereton is a former Australian rules footballer who played for the Hawthorn Football Club, Sydney Swans and Collingwood Football Club in the Australian Football League (AFL).
Born of Irish migrants, Brereton is regarded as one of key members of Hawthorn's era of dominance in the 1980s. A centre half-forward with strong marking skills and a reliable kick for goal, Brereton was renowned for his flamboyant style and rugged on-field conduct, which resulted in frequent visits to the Tribunal. For all his physicality, Brereton was as courageous as he was aggressive and his ability to play through debilitating injuries was remarkable, although inevitably this would impact him severely in later years. He also represented Victoria in State of Origin matches, and both played for and coached Australia in the International Rules Series.
Brereton was recognised for his on-field achievements when he was inducted into the Australian Football Hall of Fame in 1999. He has since become a respected member of the football media, working for various TV and radio stations in Melbourne covering the AFL as a commentator and analyst.