Saint-Denis Cathedral[1] (French: Cathédrale Saint-Denis de Saint-Denis de La Réunion)[2] or at greater length the Cathedral of St. Denis, Saint-Denis, Réunion,[3] is a Roman Catholic cathedral located in Saint-Denis, capital of the island of Reunion,[4] a province of France in the Indian Ocean, part of Africa.

It is dedicated to Saint Denis, after whom the city of Saint-Denis is named, and is the episcopal seat of the Diocese of Saint-Denis-de-La Réunion.

The whole building was registered as a monument historique on 13 October 1975.

Henri Martin-Granel worked on the windows of the cathedral.

The building was built according to plans by an engineer called Paradise, replacing a church of the 18th century.