Namasia District[1][2][3][4][5][6] (Kanakanavu language, Bunun language: Namasia; Chinese: 那瑪夏區; Hanyu Pinyin: Nàmǎxià Qū; Tongyong Pinyin: Nàmǎsià Cyu; Wade–Giles: Na4-ma3-hsia4 Ch'ü1), formerly Sanmin Township (三民鄉; Sānmín Xiāng), is a mountain indigenous district located in the northeastern part of Kaohsiung, Taiwan.

The population of the township is mainly the indigenous Bunun, Kanakanavu and Saaroa peoples.

The modern-day population of the Kanakanavu people live in the two villages of Manga and Takanua.

The four main settlements upriver are Nangisalu (南沙魯), Maya (瑪雅), and Takanua (達卡努瓦) 1 & 2.

On 24 November 2018, Payan Islituan was elected the District Magistrate of Namasia.