Senna magnifolia is a species of flowering plant in the family Fabaceae and is endemic to northern Australia.

It is an erect, spreading or straggling, mostly glabrous shrub with pinnate leaves with four to six pairs of broadly oblong to round leaflets, and yellow flowers arranged in groups of twenty to sixty, with seven fertile stamens in each flower.

Senna magnifolia is an erect, spreading or straggling shrub that typically grows to a height of up to 1.5 m (4 ft 11 in).

[2][3][4][5] This species was first formally described in 1859 by Ferdinand von Mueller, who gave it the name Cassia magnifolia in Fragmenta Phytographiae Australiae, from specimens he collected near the Gilbert River at an altitude of 1,000 ft (300 m).

[8] Senna magnifolia grows on stony hillsides, limestone outcrops and quartzite hills in the Central Kimberley, Dampierland, Great Sandy Desert, Ord Victoria Plain and Victoria Bonaparte bioregions of northern Western Australia, the Northern Territory and northern Queensland.