The Hundred of Koolywurtie (34°41′20″S 137°35′08″E / 34.688770°S 137.585630°E) is a hundred in the county of County of Fergusson in South Australia. Proclaimed on 31 December 1874, it covers an area of 320 square kilometres (123 sq mi). Its name is thought to be derived from the place known as "Koolywurtie or Black Point." The first local government body within the hundred was the District Council of Minlaton.