Baeckea leptocaulis is a species of flowering plant in the family Myrtaceae and is endemic to Tasmania.

It is a shrub with linear leaves and small white flowers with five or six stamens.

Flowering occurs between December and March and the fruit is a cylindrical to bell-shaped capsule 2.0–2.8 mm (0.079–0.110 in) long and wide.

[2][3] Baeckea leptocaulis was first formally described in 1840 by Joseph Dalton Hooker in William Jackson Hooker's Icones Plantarum from specimens collected by Ronald Gunn at Rocky Cape.

[6] This baeckea grows in wet heathland and sedgeland in western and central Tasmania.