Soledad de Graciano Sánchez, formerly Soledad Diez Gutiérrez, is the second-largest city of the state of San Luis Potosí in Mexico. It lies adjacent to the east side of the state's capital city of San Luis Potosí in the west-central part of the state. The city is the municipal seat of the municipality of the same name. The city had a 2020 Census population of 310,192, while the municipality's population was 332,072. The municipality has an area of 305.7 square kilometres.