Gigasiphon is a genus of plants in the family Fabaceae. The genus is circumscribed is defined by "a long-tubular hypanthium, an arborescent habit, and a calyx divided into two lobes". It includes five species native to eastern Africa, Madagascar, the Philippines, New Guinea, and Lesser Sunda Islands..
Species Gigasiphon comprises the following species:
Gigasiphon amplum (Span.) de Wit Gigasiphon dolichocalyx (Merr.) de Wit Gigasiphon humblotianum (Baill.) Drake Gigasiphon macrosiphon (Harms) Brenan Gigasiphon schlechteri (Harms) de Wit
Note: Gigasiphon gossweileri is now in the African monotypic genus Tournaya
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