Bernard René Michel Casoni (born 4 September 1961) is a French football manager and former player, who played as a defender. In his playing career he played for Olympique Marseille and France at Euro 1992. He is currently the head coach of MC Alger in the Algerian Ligue Professionnelle 1.
In January 2010, Casoni was named manager of Évian Thonon Gaillard FC whom he guided two successive promotions. In his first year, Championnat National side Évian reached the top of the league and then promoted to the Ligue 2 in the next season. In the 2010–11 Ligue 2, Évian won the Champion titles for the second straight year and secured promotion to the Ligue 1 for the first time since established in 2003. He voluntarily resigned from his position on 2 January 2012 in the winter break of the season.
On 17 March 2014, Casoni was sacked as coach of AJ Auxerre with the club just one point above the second tier's relegation zone.