Brendan Joseph Hansen (born August 15, 1981) is an American former competition swimmer who specialized in breaststroke events. Hansen is a six-time Olympic medalist, and is also a former world record-holder in both the 100-meter and 200-meter breaststroke events (long course).
He won twenty-five medals in major international competitions, eighteen gold, four silver, and three bronze spanning the Olympics, the World, and the Pan Pacific Championships. He was a member of the 2012 United States Olympic team and won the bronze medal in the 100-meter breaststroke and a gold medal in the 4×100-meter medley relay at the 2012 Summer Olympics.