Dillwynia tenuifolia is a species of flowering plant in the family Fabaceae and is endemic to eastern New South Wales.

The flowers are usually arranged singly in leaf axils or on the ends of branchlets on a peduncle less than 3 mm (0.12 in) long.

[2][3] Dillwynia tenuifolia was first formally described in 1825 by Augustin Pyramus de Candolle in his Prodromus Systematis Naturalis Regni Vegetabilis.

[6] This dillwynia grows in forest between the Cumberland Plain, Blue Mountains and Howes Valley on the coast and tablelands of New South Wales.

The main threats to the species and to the threatened population include habitat fragmentation, inappropriate fire regimes, weed invasion and recreational vehicle use.