Yannick Agnel (born 9 June 1992) is a French former competitive swimmer who specialized in freestyle events, and is a three-time Olympic medalist.

[4] Agnel then combined with Fabien Gilot, William Meynard, and Alain Bernard in the 4×100-meter freestyle relay to finish second behind Russia.

Agnel, with Clement Lefert, Antton Haramboure, and Jérémy Stravius finished in third place in the 4×200-meter freestyle relay behind Russia and Germany.

In his first event, Agnel anchored a come-from-behind effort in the 4×100-meter freestyle relay to win gold with Amaury Leveaux, Fabien Gilot, and Clément Lefert.

[7] Agnel won his final medal, a silver, in the 4×200-meter freestyle relay behind the United States with Amaury Leveaux, Grégory Mallet, and Clément Lefert.

[8] On 15 November 2012, Agnel broke his first world record in the 400-meter freestyle with a time of 3:32.25 during the first day of the French short course nationals in Angers.

At the 2012 European Short Course Swimming Championships in Chartres held a week after the French nationals, Agnel won a total of three medals: two gold and one bronze.

On the first day of the tournament, Agnel helped his French team capture the nation's first ever world title over the Americans and the Russians in the 4 × 100 m freestyle relay.

Teaming with Florent Manaudou, Fabien Gilot, and Jérémy Stravius in the final, Agnel recorded a lead-off split of 48.76 to deliver the French foursome a sterling time in 3:11.18.

[11][12] In his final event, 4 × 200 m freestyle relay, Agnel, along with Stravius, Grégory Mallet, and Lorys Bourelly, missed the podium by 17-hundredths of a second behind the Chinese team with a fourth-place effort in 7:04.91.

After securing a spot in the French national team, Agnel decided not to compete at the world championship in Kazan due to illness.