Typhonium johnsonianum is a species of plant in the arum family that is endemic to the Northern Territory of Australia.

The species is a deciduous geophytic, perennial herb, which resprouts annually from a hemispherical, cream-coloured corm.

The flower is enclosed in a green, brown and maroon spathe 5 cm long, appearing in December.

Only two localities are known, at Black Jungle Conservation Reserve and in Kakadu National Park.

[4] The type locality is an open grassy clearing between Acacia auriculiformis / Melaleuca forest and Lophostemon lactifluus forest, near the edge of a floodplain, in well-drained sandy soil with a high water table during the wet season.