Xinyi Township or Sinyi Township (Chinese: 信義鄉; pinyin: Xìnyì Xiāng) is a mountain indigenous township in Nantou County, Taiwan.

It is the largest township by area of Nantou County.

Xinyi is home to the Bunun people of the Taiwanese aborigines.

It has a population total of 15,576 and an area of 1,422.42 square kilometres (549.20 sq mi).

[1] The township comprises 14 villages: The township ranks first in Taiwan in terms of plum production, reaching an annual production of 20,000 tonnes.