Vacy is a locality of the Dungog Shire local government area in the Hunter Region of New South Wales, Australia. Situated between Gresford and Paterson, it includes the village of Vacy, which was founded in the 1820s as a private town by John Cory, the owner of a large land grant. Vacy began to prosper in the 1850s and was a busy town by the 1870s. It remained a private town until it was sold in 1927 by the Cory family. The village is located at the junction of the Paterson and Allyn rivers. At the 2011 census, Vacy had a population of 547.