Leucopogon tenuicaulis is a species of flowering plant in the heath family Ericaceae and is endemic to the far southwest of Western Australia.

Leucopogon tenuicaulis is a slender, erect to sprawling shrub that typically grows up to 50 cm (20 in) high and wide, and has a single stem at the base.

[2] Leucopogon tenuicaulis was first formally described in 2009 by Michael Hislop in the journal Nuytsia from an unpublished description by Jocelyn Powell of specimens collected in 1993 near Nannup by Alex George.

[4] This leucopogon grows in winter-wet heath and woodland on the flats to the north, north-east and east of Augusta in the Jarrah Forest, Swan Coastal Plain and Warren bioregions in the far south-west of Western Australia.

[5] Leucopogon tenuicaulis is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.