George Dimitrios Calombaris is a Greek Australian chef and restaurateur and television personality. Calombaris was one of the judges of the Network 10 series MasterChef Australia from 2009 to 2019. Prior to his role on MasterChef Australia, Calombaris appeared regularly on the daytime Network Ten cooking show Ready Steady Cook.

MasterChef Australia is an Australian competitive cooking reality show based on the original British MasterChef. It is produced by Endemol Shine Australia and screens on Network 10. Restaurateur and chef Gary Mehigan, chef George Calombaris and food critic Matt Preston served as the show's main judges until 2019, when they were replaced by Series 4 winner and chef Andy Allen, food critic Melissa Leong, and restaurateur and chef Jock Zonfrillo.