Sphaerolobium grandiflorum is a species of flowering plant in the family Fabaceae and is endemic to the south of Western Australia.

The flowers are usually arranged in pairs in leaf axils with scale-like bracts at the base.

Flowering occurs from September to November and the fruit is a pod that is slightly broader than long.

[2][3] Sphaerolobium grandiflorum was first formally described in 1837 by George Bentham in Stephan Endlicher's Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel from specimens collected near King Georges Sound.

[6] Sphaerolobium grandiflorum grows in winter-wet areas and swamps in the Esperance Plains, Jarrah Forest and Warren bioregions of southern Western Australia and is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.