The Cathedral of Our Lady of Fair Haven of Roseau, originally known in French as Église de Notre-Dame du Bon Port du Mouillage de Roseau, is a Roman Catholic cathedral in Roseau, the capital city of Dominica in the Caribbean. The church is the see of the Diocese of Dominica, suffragan diocese of the Archdiocese of Castries, Saint Lucia.

Roseau is the capital and largest city of Dominica, with a population of 14,725 as of 2011. It is a small and compact urban settlement, in the Saint George parish and surrounded by the Caribbean Sea, the Roseau River and Morne Bruce. Built on the site of the ancient Island Carib village of Sairi, it is the oldest and most important urban settlement on the island of Dominica.