Bernard Nicolas Thierry Diomède (born 23 January 1974) is a French former professional footballer who is the manager of the France U19s. He played as a winger and won the World Cup with France in 1998.
Born in Saint-Doulchard, to parents of Guadeloupean descent, Diomède's career began with AJ Auxerre. After playing at the youth level for the Burgundy club, he made his Ligue 1 début in 1992. He played in the first team during eight years, under Guy Roux Auxerre won the Ligue 1 and Coupe de France double in 1996. The winger scored 30 goals in 175 Ligue 1 matches for Auxerre.
In June 2000, Diomède was signed for £3m by then Liverpool F.C. manager Gérard Houllier. Making his debut against Sunderland, Diomède appeared to have scored with an overhead kick, but the goal was not given even though replays showed that the ball had crossed the line. However, he did not settle in England, and only played five games for Liverpool. In January 2003 he was loaned out to AC Ajaccio, newly promoted in France's Ligue 1, until the end of his contract. After his spell at Liverpool had come to an end, he joined the Ligue 2 team Créteil, and then Clermont Foot in the Championnat National (3rd division). As of 18 January 2008, Bernard Diomede has announced his retirement after being without a club for the past 18 months.