Mackenzie James Horton OAM (born 25 April 1996) is an Australian retired[4] freestyle swimmer. He is an Olympic gold medallist, World Championships gold medallist, and 4-time Commonwealth Games gold medallist. At the 2016 Olympic Games in Rio de Janeiro, Brazil, he took the gold in the 400m freestyle, and became the first male swimmer from the state of Victoria to win an Olympic swimming gold in the Games' history.[5][6]