Carondelet High School is an all-girls private Catholic high school in Concord, California. Carondelet High School was founded by the Sisters of Saint Joseph. The school of about 800 students was founded in 1965. It shares some resources with the all-boys school, De La Salle High School, which is across a side-street that separates them. De La Salle High School was founded by the Christian Brothers. Students in their junior and senior years are able to take classes at the other school for four of the school's six class periods, and also as lowerclassmen for language and art.