The Old City of Zuoying (Chinese: 左營舊城; pinyin: Zuǒyíng Jiùchéng), also known as the Old City of Fongshan County (Chinese: 鳳山縣舊城; pinyin: Fengshan Xiàn Jiùchéng), is a walled city located in Zuoying District, Kaohsiung, Taiwan. It was built during the Qing rule period and is one of the first Taiwanese cities fortified by a defensive wall. The city was administrated under the Fongshan County (鳳山縣) of Taiwan Prefecture.
Zuoying was a major juncture of the Kaohsiung plain, and therefore possesses strategic advantages. Nearby mountains such as the Turtle Mountain (龜山) and the Snake Mountain (蛇山) created nature barriers, making the place easily defensible. In 1684, Taiwan was annexed by the Qing Dynasty, which favored the strategic advantages the place provided. The Qing government set up the Fongshan County seat in Hsinglungchuang (興隆莊) and built government buildings and Confucian Temples, gaining its significance. The early Qing dynasty prohibited the construction of defensive walls in Taiwan to prevent rebellions, so the city never obtained its wall until 1721. In 1721, Chu Yi-kuei led a rebellion in southern Taiwan and captured the county, which had no protection, and ruined many government buildings. After the incident, Qing permitted building defensive walls in Taiwan. The governor of Tsoying County Liou Kwang-shi (劉光泗) built the first city wall made of mud with a moat system in 1722.