The Caoqiao Mosque (), also known as the Grass Bridge Mosque, is a mosque in the Qinhuai District of Nanjing City, in the Jiangsu province of China.
The mosque was constructed during the Qianlong Emperor () rule of the Qing dynasty. Since then, the mosque has been reconstructed and removed several times.
The mosque was built in the traditional Chinese architectural style. It consists of main prayer hall, teaching room, wudu, and wing room.
The mosque houses the headquarters of Chinese Hui Religion Association (), established in 1912.
The mosque is accessible within walking distance west of Zhangfuyuan Station of Nanjing Metro.