Namasia District (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. It is the second largest district in Kaohsiung after Taoyuan District.

Takao Prefecture was one of the administrative divisions of Taiwan during the Japanese rule. The prefecture consisted of modern-day Kaohsiung City and Pingtung County.