Lechenaultia expansa is a species of flowering plant in the family Goodeniaceae and is endemic to the south-west of Western Australia.

It is a prostrate to erect subshrub with wand-like branches, crowded, narrow, fleshy leaves and pale purple-blue, tube-shaped flowers.

Lechenaultia expansa is a prostrate or erect subshrub that typically grows to a height of up to 60 cm (24 in) and has wand-like branchlets.

The flowers are arranged in dense clusters in leaf axils, the sepals 4.5–5.5 mm (0.18–0.22 in) long and glabrous.

[2][3] Lechenaultia expansa was first formally described in 1810 by Robert Brown in his Prodromus Florae Novae Hollandiae et Insulae Van Diemen.