Gansu (simplified Chinese: 甘肃; traditional Chinese: 甘肅; pinyin:  Gānsù; Wade–Giles: Kan-su, Kansu, Kan-suh) is a province of the People's Republic of China, located in the northwest of the country.
It lies between the Tibetan and Huangtu plateaus, and borders Mongolia, Inner Mongolia, and Ningxia to the north, Xinjiang and Qinghai to the west, Sichuan to the south, and Shaanxi to the east. The Yellow River passes through the southern part of the province.
Gansu has a population of 26 million (2009) and has a large concentration of Hui Chinese, and the historical home, along with Shaanxi of the dialect of the Dungans, who are Hui who migrated to Central Asia. The southwestern corner of Gansu is home to a large ethnic Tibetan population. The capital is Lanzhou, located in the southeast part of the province.