The Diocese of Le Havre (Latin: Dioecesis Portus Gratiae; French: Diocèse du Havre [djɔsɛz dy ɑvʁ(ə)]) is a Latin diocese of the 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.

In 2021, in the Diocese of Le Havre there was one priest for every 8,128 Catholics.

• Michel Marie Paul Saudreau (1974–2003)
• Michel Jean Guyard (2003–2011)
• Jean-Luc Brunin (since 2011)

• Catholic Church in France

• (in French) Centre national des Archives de l'Église de France, L’Épiscopat francais depuis 1919, retrieved: 2016-12-24.
• Catholic Hierarchy page

49°29.25′N 0°6.5′E / 49.48750°N 0.1083°E / 49.48750; 0.1083