Suao Township (), alternately romanized as Su-ao or Su'ao, is located in southern Yilan County, Taiwan, is an urban township that is famous for its seafood restaurants and cold springs. It is a terminus of National Highway No. 5, the Suao-Hualien Express Way, and the North-Link Line of Taiwan Railway. It also has two large harbors: Suao Port, a seaport that also houses a naval base, and Nanfang-ao Port, a major fishing port of Taiwan.
During Japanese rule, the area was established as , Suà  District, Taihoku Prefecture. After World War II, the town was converted to a township under Taipei County. In 1950, the township was put under the newly established Yilan County.
As of September 2023, Suao had 14,533 households and a total population of 37,602, including 18,520 females and 19,082 males. The population of Suao Town has been decreasing on average since 1981.
The township comprises 26 villages: Aiding, Cunren, Dingliao, Gangbian, Longde, Nanan, Nancheng, Nanjian, Nanning, Nanqiang, Nanxing, Nanzheng, Shengai, Shenghu, Subei, Sunan, Sutung, Suxi, Tungao, Xincheng, Yongchun, Yongguang, Yongle, Yongrong, Zhangan and Zhaoyang.
Suao has a humid subtropical climate (Köppen Classification Cfa).