Gaoyao, alternately romanized as Koyiu, is an urban district of Zhaoqing in western Guangdong, China.

Gaoyao is the pinyin romanization of the Chinese name, based on its Mandarin pronunciation; the former Chinese Postal Map spelling was based on the local Cantonese pronunciation of the same name.

[2] Gaoyao is located on the southern bank of the Xi River, opposite central Zhaoqing.

Under the Sui, the administration relocated across the river to Duanzhou, which was renamed Zhaoqing under the Song.

[2] It was promoted to a county-level city in 1993 and later to urban district status.