The Hundred of Koolywurtie is a hundred in the County of Fergusson in South Australia. 
It was proclaimed on 31 December 1874. it covers an area of . 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.
The localities of Koolywurtie, Port Rickaby and Bluff Beach, and the northern end of the locality of Maitland are within the hundred.
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