Leptospermum deuense is a shrub that is endemic to New South Wales, Australia It grows to about 1.5 metres high and has elliptic to obovate leaves that are about 10 to 30 mm long and 6 to 8 mm wide. The flowers, which are solitary or in pairs, appear in February in the species native range. These are followed by fruits that are 8 to 10 mm in diameter.