The souimanga sunbird (Cinnyris sovimanga) is a small passerine bird of the sunbird family, Nectariniidae. It is native to the islands of the western Indian Ocean where it occurs on Madagascar, the Aldabra Group and the Glorioso Islands.
The souimanga sunbird was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the tree-creepers in the genus Certhia and coined the binomial name Certhia sovimanga. The specific epithet sovimanga comes from a French name for the bird, Souï-manga. Gmelin based his account on "Le grimpereau violet de Madagascar" that had been described and illustrated in 1760 by the French zoologist Mathurin Jacques Brisson and Le Soui-Manga that had been described in 1778 by the Comte de Buffon. The souimanga sunbird is now placed in the large genus Cinnyris that was introduced in 1816 by the French naturalist Georges Cuvier.
Five subspecies are recognised: