The Id Kah mosque is a mosque located in Kashgar, Xinjiang, in the western People's Republic of China. It is the largest mosque in China. Every Friday, it houses nearly 10,000 worshippers and may accommodate up to 20,000.
The mosque was built by Saqsiz Mirza in ca. 1442 (although it incorporated older structures dating back to 996) and covers 16,800 square meters.
In 1933, on August 9, the Chinese Muslim General Ma Zhancang killed and beheaded the Uighur leader Timur Beg, displaying his head on a spike at Id Kah mosque.