The Xiguan Mosque (), also known as the West Cross Mosque Lanzhou, is a mosque in the Chengguan District of Lanzhou City, in the province of Gansu, China.
The mosque was built during the Wanli Emperor of the Ming dynasty. During the Qing dynasty, the mosque underwent two major reconstructions. The mosque was rebuilt in 1990 when a dome was added with four pagoda-topped minarets. In 2023, the Lanzhou government transformed the Xiguan Mosque to a minimalist style, removing the dome and minarets as part of a national effort to sinicize Islam in China.
The style of the mosque follows the Arabic Islamic and minimalist styles, while the prayer hall combines the Chinese classical and Arabic architectural styles. The mosque covers an area of with its prayer hall spanning .
The architecture of the mosque was intended to mimic and echo the style of Al-Aqsa Mosque in Jerusalem.