Sijhih (汐止; Wade-Giles: Hsichih; Hanyu Pinyin: Xizhi; Tongyong Pinyin: Sijhih), also commonly spelled "Hsichih", is a city in Taipei County, Taiwan Province of the Republic of China. Literally, Sijhih means the end of tides. This is because the tide can be observed only downstream from Sijhih along the Keelung River . It is located between Taipei City and Keelung City. Due to its important location, both north-south freeways (National Highway No. 1 and National Highway No. 3) pass by Sijhih as well as the Western Line railroad.
Its population grew up quickly in the 1980s and 1990s and has become an important suburban city. Sijhih suffered serious flooding several times before the embankment along the Keelung River was constructed in 2002.
Sijhih is home to many companies, such as Acer.