Cycas arnhemica is a species of cycad in the genus Cycas, native to Australia, in the northwest of Northern Territory in Arnhem Land, after which it is named. The stems are erect, growing to 1.5-2.5 m tall. The leaves are numerous, flat, 70-160 cm long, pinnate, with 160-260 leaflets; the new young leaves are deep white tomentose at first, becoming bright to dark green, moderately glossy above, the down often persisting on the underside. There are three subspecies: