William Petric (born 3 August 2004) is an Australian Olympic Swimmer. In 2024, Petric qualified for the Summer Olympics in Paris after placing second in the 400 Individual Medley event at the Australian Olympic trials.

In his Olympic Debut, William finished 12th in the 400 Individual Medley and 10th in the Semifinal of the 200 Individual Medley.

Through a scholarship offered by the Australian Sport Hall of Fame, William is mentored by two-time AFL Brownlow Medalist, Chris Judd.