Leucopogon subsejunctus is a species of flowering plant in the heath family Ericaceae and is endemic to a restricted area in the south-west of Western Australia.

Leucopogon subsejunctus is an erect, open shrub that typically grows up to about 80 cm (31 in) high and wide with a single stem at the base.

[2] Leucopogon subsejunctus was first formally described in 2014 by Michael Clyde Hislop in the journal Nuytsia from specimens he collected near Rocky Gully in 2008.

[2] This leucopogon grows in woodland near Darkan in the Jarrah Forest bioregion in the south-west of Western Australia.

[2][4] Leucopogon subsejunctus is listed as "Priority Two" by the Western Australian Government Department of Biodiversity, Conservation and Attractions,[4] meaning that it is poorly known and from only one or a few locations.