Ian Dewhurst (born 13 November 1990) is an Australian athlete specialising in the 400 metres hurdles. He won a bronze medal at the 2013 Summer Universiade. In addition, he represented his country at the 2014 and 2018 Commonwealth Games without qualifying for the final. In July 2019, he won a gold medal at the 2019 Pacific Games in Apia, where he set a Games record of 50.86 seconds. His personal best in the event is 49.52 seconds set in Melbourne in 2014.