Warialda is a town in the Northwest Slopes region of New South Wales, Australia, in Gwydir Shire. Situated on the banks of Warialda Creek, the town's name means "Place of Wild Honey." At the , Warialda had a population of 1,120.
Warialda was the first town gazetted in the Northwest Slopes region, probably in the 1830s, and was the headquarters of the Yallaroi Shire, until its merger with neighbouring Bingara Shire to form Gwydir Shire. Warialda Post Office opened on 1 January 1848.
Warialda is the birthplace of Elizabeth Kenny, world renowned pioneer in the treatment of poliomyelitis. The baptismal font used for Sister Kenny's baptism is still in use and housed in the Church of England located in Stewart Avenue.
Warialda is also the birthplace of Olive Rose Fitzhardinge (1881–1956) who became famous in the 1930s as a rose breeder in Warrawee, the name of her best known rose.