Ptilotus rotundifolius <small>(F.Muell.) F.Muell.</small> is a pink-flowered species of shrub in the genus Ptilotus <small>R.Br.</small> (Amaranthaceae). It is commonly known as "royal mulla mulla". It is native to the Gascoyne, Murchison and Pilbara IBRA regions of Western Australia.