Niangzi Pass, also called the Ladies' Pass, is a mountain pass west of Shijiazhuang, capital of Hebei Province in North China. One of the major passages from Shanxi Province to Hebei Province across the Taihang Mountains, it is 55 kilometres west of Shijiazhuang, at the point where the Shitai Railway crosses the border between the two provinces on its way to Taiyuan.
Surrounded by a maze of hills and valleys, Niangziguan Pass was famed as "the Ninth Pass on the Great wall". The extant pass was built in 1542 during the Ming Dynasty. The pass is flanked by hills more than 1,000 metres high. A river, the Tao River, twists its way through the valleys below. In ancient times this provided a narrow passage for men and horses.
Legend goes that during the Tang Dynasty, the army under the command of Princess Pingyang, daughter of Li Yuan, the first emperor of the Tang Dynasty, once garrisoned here. Hence the name "Ladies Pass."
Its defence played an important part in the Battle of Xinkou between the Chinese Nationalists and the Japanese.