Xanthosia tasmanica is a species of flowering plant in the family Apiaceae and is endemic to southern Australia.

Xanthosia tasmanica is an erect or ascending perennial herb that typically grows to a height of 20 cm (7.9 in) and has a few long spreading hairs on its stems and leaves.

There are up to four linear, leaf-like bracts 3–4 mm (0.12–0.16 in) long at the base of the flowers and leaf-like green bracteoles 3–4 mm (0.12–0.16 in) long at the base of the peduncles.

[2][3] Xanthosia tasmanica was first formally described in 1907 by Karel Domin in Repertorium Specierum Novarum Regni Vegetabilis, from specimens collected between George Town and Circular Head.

[4] This species of xanthosia grows in coastal heath or forest from the south coast of New South Wales, southern Victoria, the Fleurieu Peninsula and Kangaroo Island of South Australia, the Esperance Plains, Jarrah Forest, Swan Coastal Plain and Warren bioregions of south-western Western Australia and Tasmania.