Sungai Ujong is a former district of Negri Sembilan. It has a ceremonial head known as the Undang of Sungai Ujong. He is one of the four Undang of Negri Sembilan with the power to elect the Yamtuan Besar, apart from the Undang of Jelebu, Johol and Rembau. The Undang themselves cannot be elected as Yamtuan Besar. They need to choose a male heir and descendent of Raja Radin ibni Raja Lenggang as Yamtuan Besar. The district of Sungai Ujong is today Seremban District.