Gastrolobium trilobum, commonly known as bullock poison,[2] is a flowering plant in the family Fabaceae, and is endemic to Western Australia.

Gastrolobium trilobum is a spindly, spreading, prostrate shrub with needle-shaped hairy stems, some sections partly spiky.

[2] Gastrolobium trilobum was first formally described in 1839 by John Lindley from an unpublished description by George Bentham.

Lindley's description was published in A Sketch of the Vegetation of the Swan River Colony.

[5] Bullock poison grows in the Avon Wheatbelt, Jarrah Forest and mallee.