The Borough of Onslow was a local government district immediately to the north of Wellington, New Zealand. Incorporated on 13 March 1890 it included the districts of: Wadestown, Crofton, Khandallah and Kaiwarra but not Johnsonville.[1][2] It replaced the Kaiwarra Town Board, the Wellington District Roads Board and a small part of the very wide jurisdiction of the Hutt County Council. Johnsonville Town Board remained independent.[3]
Most of the population, in Wadestown, amalgamated with Wellington City in 1907, the rest in 1919.