Seton LaSalle Catholic High School, located in Mt. Lebanon, Pennsylvania, was formed in 1979 as a merger between the all-boys South Hills Catholic High School, served by the Christian Brothers, and the all-girls Elizabeth Seton High School, founded by the Sisters of Charity of Seton Hill. As the largest coeducational high school in the Diocese of Pittsburgh, Seton LaSalle serves the parishes of Pittsburgh’s South Hills and surrounding suburbs.