Qitai County (simplified Chinese: 奇台县; traditional Chinese: 奇台縣; pinyin: Qítái xiàn; Xiao'erjing: ٿِتَیْ ﺷِﯿًﺎ; Uyghur: گۇچۇڭ ناھىيىسى‎, ULY: Guchung Nahiyisi, UYY: Guqung Nah̡iyisi^?), historically known as Gucheng (古城), is a county in the Xinjiang Uyghur Autonomous Region of China under the administration of the Changji Hui Autonomous Prefecture.