The yellow-mantled widowbird (Euplectes macroura), also known as the yellow-backed widow, is a species of bird in the family Ploceidae. It is the type species of the genus Euplectes, originally named for the city of Ouidah in Benin. Nowadays the name whydah (from "Ouidah") is however applied to some species in the Viduidae.
Males are larger than females and acquire longer tails and striking black and golden yellow plumages in the breeding season. The mantle colour is either golden yellow, or in the case of the northeastern race, E. m. macrocercus, black. The yellow shoulders persist in all male plumages, whether breeding or non-breeding.