Backhousia angustifolia, the narrow leaf myrtle, is a shrub or tree in the family Myrtaceae. It is found primarily in south-central Queensland with vagrant populations extending into North Queensland and New South Wales.
As a tree it is capable of growing up to 15 metres tall. It flowers from November to July and fruits in January and February. It has a narrowly elliptical or ovate leaf shape. It has a capsule, nut or samara fruit structure, with a flattened ovoid seed shape.
It has been assessed as Least Concern under the Nature Conservation Act 1992.