Leionema westonii is a flowering plant in the family Rutaceae and is endemic to New South Wales.

Leionema westonii is a multi-branched shrub to 70 cm (28 in) high and forms a rhizome.

The leaves are linear-shaped or narrow elliptic, 6–16 mm (0.24–0.63 in) long, 1–1.8 mm (0.039–0.071 in) wide, margins rolled under, apex pointed, upper surface covered with spreading, soft, weak hairs, lower surface covered with white, minute protuberances and with sparsely soft, fine, weak hairs.

[3][4] The specific epithet (westonii) honours Peter Henry Weston a co-discoverer of the species in 2004.

[4] This leionema grows in woodland on shallow soils in the Oxley Wild Rivers National Park.