Leptospermum morrisonii is a shrub or small tree that is endemic to New South Wales, Australia. It grows to between 2 and 5 metres high and has narrow leaves that are about 15 to 35 mm long and 2 to 8 mm wide. The greenish cream or white flowers are about 15 mm in diameter and appear in late December and January in the species native range. The species was formally described in 1989 by Joy Thompson in Telopea, based on plant material collected near Mount Dhruwalgha, south-east of Robertson.