The Open Castilla y León is a professional tennis tournament played on outdoor hardcourts. It is currently part of the ATP Challenger Tour and the ITF Women's Circuit. It has been held annually at the Villa de El Espinar in El Espinar, Segovia Province, Spain since 1986 (as a Spanish Tennis Federation event from 1986 to 1990, as a Challenger since 1991). The men's event was part of the Tretorn SERIE+ from 2019 to 2011. The women's event was added to the tournament in 2015.