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| 台21線 | ||||
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| Route information | ||||
| Maintained by Directorate General of Highways | ||||
| Length | 144.385 km (89.717 mi) | |||
| Major junctions | ||||
| North end |  Prov 8 in Dongshi, Taichung City | |||
 Nat 6 in Puli | ||||
| South end |  Prov 18 in Xinyi, Nantou | |||
| Location | ||||
| Country | Taiwan | |||
| Highway system | ||||
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Taiwan Provincial Highway No. 21 is a Provincial Highway in Taiwan that begins at Tianleng (天冷), Dongshi District, Taichung City, at the intersection with Provincial Highway No. 8 (Central Cross-Island Highway), and ends at Tataka(塔塔加), where it is connected with Provincial Highway No. 18 (New Central Cross-Island Highway) in Yushan National Park. It is the primary highway to Sun Moon Lake, a popular tourist destination. The total length is 145 km.[1]
A southern segment of the highway became Provincial Highway 29 in 2014. The segment was from Namasia to Linyuan in Kaohsiung City, and ran along the Cishan River(旗山溪) as well as the Gaoping River(高屏溪). The road between Tataka and Namasia was not built due to environmental and ecological issues.