South Korean short-track speed skater, who was the top male medal winner at the 2006 Winter Olympics in Turin, Italy.

Ahn started short-track skating at age eight, inspired by countryman Chae Ji Hoon, who captured a gold and a silver medal at the 1994 Winter Olympics in Lillehammer, Nor. At 5 feet 4 inches (1.64 metres) and 120 pounds (54 kg), Ahn was perfectly built for the fast speeds and tight corners of short track. In 2002 he won the overall world junior championships and finished second at the senior world championships. Later that year he made his Olympic debut at the Winter Games in Salt Lake City, Utah, but had disappointing results. Ahn was one of the favourites in the 1,000 metres, but in the final China's Li Jiajun caused a pileup that knocked out everyone except Australian Steven Bradbury (then skating in last place), who won the race by default; Ahn finished fourth. Ahn was later disqualified in the 1,500-metre semifinal and left Salt Lake City without a medal. During the 2003 season, however, he recovered his momentum, setting world records at 1,500 metres and 3,000 metres and capturing the first of five consecutive world overall titles.

At the 2006 Winter Games, Ahn won the 1,500 metres to capture his first gold medal and then set an Olympic record in the 1,000 metres en route to his second gold. He took a bronze medal in the 500 metres. In the final event, the 5,000-metre relay, he followed his usual strategy by holding off until the final laps. He then sprinted for the finish from an outside passing lane to give South Korea its sixth short-track gold medal and another Olympic record time. As the competition played out, Ahn held off the challenge of his biggest rival, American Apolo Anton Ohno, who won the 500 metres but never seriously challenged Ahn in any other event.