Harmogia is a monotypic genus of flowering plants in the family Myrtaceae. The sole species is Harmogia densifolia which is endemic to Australia. Harmogia densifolia is a shrub to 1.5 metres high with linear or terete leaves. White flowers appear in spring or summer with 5 round petals surrounding 7 to 10 stamens. It occurs from Nowra in New South Wales northwards through the east of the state and into Queensland.