Acacia baileyana or Cootamundra wattle is a shrub or tree in the flowering plant family Fabaceae. The scientific name of the species honours the botanist Frederick Manson Bailey. It is indigenous to a very small area in southern inland New South Wales, comprising Temora, Cootamundra, Stockinbingal and Bethungra districts. However, it has been widely planted in other Australian states and territories. In many areas of Victoria, it has become naturalised and is regarded as a weed, outcompeting indigenous Victorian species.

Frederick Manson Bailey was a botanist active in Australia, who made valuable contributions to the characterisation of the flora of Queensland. He was known by his middle name, Manson.