The Golden Wattle (Acacia pycnantha) is a tree of the genus Acacia and the family Mimosaceae. The phylogenetic classification places it in the subfamily Mimosoideae and the family Fabaceae. It grows in south-eastern Australia (mainly in southern New South Wales).
It has been described by English botanist George Bentham in 1842.
It is the national flower of Australia, officially since 1988, but recognized as such by many Australians since the early twentieth century. It is called Golden Wattle in English.
It was harvested for use in tanneries, which has contributed to deforestation in some regions of Australia.