Castraz is a municipality in the province of Salamanca, western Spain, part of the autonomous community of Castile-Leon. It is located 67 kilometres (42 mi) from the city of Salamanca and as of 2018 has a population of only 42 people. The municipality covers an area of 30 km2 (12 sq mi) and lies 760 metres (2,490 ft) above sea level.