Gompholobium grandiflorum, known as the Large Wedge-pea, is a shrub of the pea family which is endemic to the central eastern parts of New South Wales, in Australia. A common plant around Sydney and the Blue Mountains. It is seen as far south as Jervis Bay. The habitat is heath on sandstone soils, open forest or eucalyptus woodland. The specific epithet grandiflorum refers to the impressive lemon/yellow flowers. Leaves are in threes, very narrow, 20 to 30 mm long and 1 mm wide. Flowering occurs in late winter and spring. The fruit is a pod, around 15 mm long.