Xavier Gagnepain (born 1960) is a French contemporary classical cellist.
Gagnepain studied at the Conservatoire de Paris and Yale University in the U.S.A.
and is the cellist of the Rosamonde Quartet (laureate of the Concours International of Évian in 1983 with the Prix d'interprétation de compositeurs modernes and the Prix spécial du Jury international des critiques and First Prize of the international competition of string quartets of the Union des Radios Européennes in Salzbourg in 1986).
In 1996, Gagnepain was the first to perform in concert the 12 pieces on the name of Paul Sacher, contemporary repertoire for cello solo, famous for its difficulty.
His discography includes both concertos and chamber music ranging from duets to sextets.