Guanshan Township () is an urban township in northern Taitung County, Taiwan.
Formerly called Lilong, which is from the Amis word meaning "red worms" and rendered in Hokkien as A-lÃÂ-lóng (é¿éÂÂå£Â). By 1920, the town was called Kanzan Town under Kanzan District, Taità  Prefecture.
It is located in the Huatung Valley South segment. Beinan River flows through. In the east it is bordered by the Hai'an Range and in the west by the Central Mountain Range. Guanshan has a Tropical Monsoon Climate. Annual rainfall is 2,000 mm with an average temperature of 23.7 degrees Celsius.
Covering an area of 58.735 km<sup>2</sup>, Guanshan has a population of 8,160 people (as of February 2023).
Guanshan Township consists of 7 villages, namely Chungfu, Fengchuan, Hsinfu, Lilong, Tekao, Tienkuan and Yuemei, and 135 neighborhoods.
Rice is the most important crop in the township due to its relatively flat terrain suitable for paddy field.
Guanshan Township is accessible from Guanshan Station and Haiduan Station of Taiwan Railway.