The Roman Catholic Diocese of Le Havre is a diocese of the Latin Rite of the Roman Catholic church, in France. Erected in 1974, the episcopal see is Le Havre Cathedral, in the city of Le Havre. The diocese comprises the arrondissement of Le Havre, in the department of Seine-Maritime, Normandy.
The diocese was created from territory of the Archdiocese of Rouen, and remains suffragan to the parent diocese.
The current bishop is Jean-Luc Brunin, appointed in 2011.