The 2009 European Junior Swimming Championships were held from 8–12 July 2009 in Prague, Czech Republic. The age groups for this event are girls born in 1993 or 1994 and boys born in 1991 and 1992. The tournament is organized by LEN, the European Swimming League, and was held in a 50 m pool.

Yannick Agnel is a French former competitive swimmer who specialized in freestyle events, and is a three-time Olympic medalist. In his Olympic debut at the 2012 Summer Olympics in London, he won gold in the 200-meter freestyle, gold in the 4×100-meter freestyle relay, and silver in the 4×200-meter freestyle relay. He is the current world record holder in the 400-meter freestyle, the European record holder in the 800-meter freestyle, and the national record holder in the 200- and 400-meter freestyle.