Brent Matthew Hayden (born October 21, 1983) is a Canadian competitive swimmer.
Representing Canada for a decade, Hayden is regarded as the fastest swimmer in Canadian history.
Hayden won a bronze medal in the 100-metre freestyle at the 2012 Summer Olympics in London with a time of 47.80.
He was world champion in the same event in 2007 with Filippo Magnini of Italy.
By winning the 100-metre, Hayden became the first Canadian in 21 years to win a gold medal at the World Aquatics Championships, he was also the first Canadian to appear in the 100-metre final at the Olympics since Dick Pound at the 1960 Summer Olympics, and the first Canadian to win an Olympic medal in the 100-metre.
Hayden adds a further three silver and one bronze medal to his World Championship totals.
In addition, Hayden is currently the Canadian record-holder in the 200-metre, 100-metre and 50-metre freestyle in both the short-course and long-course.
He has also held the world record in the 4×100-metre medley relay, and the 4×200-metre freestyle relay.
In October 2019 it was announced that Hayden was coming out of retirement, with the goal of qualifying for the 2020 Summer Olympics in Tokyo, Japan.