The Diocese of Versailles (Latin: Dioecesis Versaliensis; French: Diocèse de Versailles) is a Latin diocese of the Catholic Church, in France. The diocese, headed by the Bishop of Versailles, was established in 1801. Until then, its territory had mostly been part of the Archdiocese of Paris and the Diocese of Chartres. It was centred on Versailles.
On its creation in 1791 by the Constituent Assembly, the territory of the diocese of Versailles corresponded to the département of Seine-et-Oise.
Following the boundary changes of the départements of ÃÂle-de-France in 1964, new dioceses were established on 9 October 1966. The diocese of Versailles was therefore modified to correspond to the département of Yvelines, following the creation of the Dioceses of ÃÂvryâÂÂCorbeil-Essones, Nanterre, Saint-Denis, Créteil, Pontoise.