The Id Kah Mosque (Uighur: ھېيتگاھ مەسچىتى, romanized: Hëytgah Meschiti, Хейтгах Месчити; simplified Chinese: 艾提尕尔清真寺; traditional Chinese: 艾提尕爾清真寺; pinyin: Àitígǎěr Qīngzhēnsì; from Persian: عیدگاه, Eidgāh, meaning "Place of Festivities") is a historic mosque and tourist site. The mosque was built by Saqsiz Mirza, the elder of two sons of Amir Sayyid Ali, in ca. 1442 (although it incorporated older structures dating back to 996) to commemorate his ancestors. The mosque covers an area of around 16,000 square meters.
The mosque's modern golden-brick structure was built in 1798, replacing the older building, and was further expanded in 1838 to its current size. The mosque received a renovation in 1981, and the mosque's façade was covered with tiles between 2004 and 2005.