The Roman Catholic Diocese of Cayenne (Latin: Dioecesis Caiennensis; French: Diocèse de Cayenne) (erected 1651, as the Prefecture Apostolic of French Guiana-Cayenne) is a suffragan diocese of the Archdiocese of Fort-de-France.

It was elevated on to the Vicariate Apostolic of French Guiana-Cayenne on 10 January 1933 and to the Diocese of Cayenne on 29 February 1956.

The seat of the bishop is in Cayenne Cathedral.

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