Acacia baileyana or Cootamundra wattle is a shrub or tree in the flowering plant family Fabaceae.

It is indigenous to a very small area in southern inland New South Wales, comprising Temora, Cootamundra, Stockinbingal and Bethungra districts.

In many areas of Victoria, it has become naturalised and is regarded as a weed, outcompeting indigenous Victorian species.

Also, it hybridises with some other wattles, notably the rare and endangered Sydney Basin species Acacia pubescens.

Its origin is unknown, but it is a popular garden plant, with its cascading horizontal branches good for rockeries.