The Beishi River (Chinese: 北勢溪; Hanyu Pinyin: Běishì Xī; Tongyong Pinyin: Běishìh Si; Wade–Giles: Pei3-shih4 Hsi1) is a river in northern Taiwan. It flows through New Taipei City and Yilan County for 50 km. It is one of tributaries of Xindian River. The river is impounded by the Fetsui Reservoir in Shiding District, New Taipei City.
Coordinates: 24°54′18″N 121°33′26″E / 24.90500°N 121.55722°E / 24.90500; 121.55722