Lasiopetalum micranthum is a species of flowering plant in the family Malvaceae and is endemic to a small region of eastern Tasmania. It is a low, spreading shrub with thin, rusty-hairy branches, narrow oblong leaves and drooping, star-shaped red to greyish-pink or white flowers.
Lasiopetalum micranthum is a low, spreading shrub that typically grows to a height of up to , its branches covered with rust-coloured, star-shaped hairs. The leaves are narrow oblong, mostly long, the edges rolled under and depressions above the veins on the upper surface. The flowers are borne in drooping groups with brown sepal-like bracts and red to greyish-pink or white petal-like sepals. The fruit is a hairy capsule up to wide.
Lasiopetalum micranthum was first formally described in 1855 by Joseph Dalton Hooker in The botany of the Antarctic voyage of H.M. Discovery ships Erebus and Terror from a specimen collected by Ronald Campbell Gunn. The specific epithet (micranthum) means "small-flowered".
This lasiopetalum grows in forest or woodland at altitudes of up to in the central east coast of Tasmania between the Meredith and Swan Rivers near Swansea.
Lasiopetalum micranthum is listed as "rare" under the Tasmanian Government Threatened Species Protection Act 1995.