Prostanthera suborbicularis is a species of flowering plant in the family Lamiaceae and is endemic to Queensland.

Prostanthera suborbicularis is a shrub or undershrub that has its branches and leaves covered with short, matted hairs.

The flowers are arranged singly in leaf axils on pedicels up to 2 mm (0.079 in) long, with bracteoles at the base of the sepals.

[2] Prostanthera suborbicularis was first formally described in 1926 by Cyril Tenison White and William Douglas Francis in the Proceedings of the Royal Society of Queensland from specimens collected near Adavale.

[4] This mintbush is listed as of "least concern" under the Queensland Government Nature Conservation Act 1992.