Isopogon dawsonii, commonly known as the Nepean conebush,[2] is a shrub of the family Proteaceae and is endemic eastern to New South Wales.

It has pinnate leaves with narrow segments and spherical heads of creamy yellow to greyish white flowers.

The flowers are arranged in more or less spherical, sessile heads 40–45 mm (1.6–1.8 in) long in diameter with overlapping egg-shaped involucral bracts at the base.

[2][3][4][5] Isopogon dawsonii was first formally described in 1895 by R.T. Baker in Proceedings of the Linnean Society of New South Wales from an unpublished manuscript by Ferdinand von Mueller.

[5][7] Nepean conebush occurs naturally on sandstone slopes and near cliff edges in heathland and dry sclerophyll forest in the valleys of the Goulburn and Nepean Rivers, on the Central Coast, the Central Tablelands and the Western Slopes down to Lithgow.