The Réunion fody (Foudia delloni) is an extinct bird species from the family of weavers. It was endemic to the Mascarene island of Réunion. This bird was first mentioned in a report by traveller Gabriel Dellon and a second time in 1674 by Dubois. The species, of which no museum specimen exist was formally described as new species by Anthony Cheke and Julian Pender Hume in the Book Lost Land of the Dodo in 2008.