Jean-Denis Gauthier (Montaigu 13 November 1810 â 1 December 1877) was a French bishop in Vietnam. He was a deacon at the seminary of the Missions-étrangères de Paris, left for Vietnam in 1835, was ordained there in 1842, and died at Nghi Diên (nôm: xã ÃÂoài), Nghi Lá»Âc District, Nghá» An Province in 1877.