Royalla is a rural locality on the border of New South Wales and the Australian Capital Territory. The area takes its name from the nearby Mount Rob Roy, and was originally a railway settlement on the Bombala railway line known as Rob Roy and changed to the current name in 1905. Modern Royalla is a large rural locality east of the Monaro Highway. The border with the ACT follows the western boundary of the easement of the former railway line to the east of the highway.