Saitobaru Kofun Cluster (Japanese: 西都原古墳群) is a group of three hundred thirty three kofuns or tumuli in Saito city, Miyazaki Prefecture, Japan. This is one of the largest kofun groups in Japan, and the largest group in Kyushu situated on a 70-meter hill composed of diluvium. It is located within the Saitobaru-Sugiyasukyō Prefectural Natural Park.