Cantagallo is a village and municipality in the province of Salamanca, in the autonomous community of Castile and León, western Spain. It lies about 90 kilometres (56 mi) from the city of Salamanca, the provincial capital.
The municipality covers an area of 87.51 square kilometres (33.79 sq mi) and sits at an elevation of 932 metres (3,058 ft) above sea level. As of 2016 its population was 263 people. Its postal code is 37792.