Seton LaSalle Catholic High School, located in Mt. Lebanon, Pennsylvania, was formed in 1979 by the merger of two outstanding Pittsburgh institutions: the all-boys South Hills Catholic High School and the all-girls Elizabeth Seton High School. 

Initially, the school was staffed by Christian Brothers, Sisters of Charity, and lay faculty from both original schools. The Sisters of Charity still maintain the important presence of a religious community within Seton LaSalle. 

The students who were part of the original transition years quickly adapted to their new surroundings and classmates, in part due to the hard work of Brother Joseph Mahon, the school's first principal, and Sister Donna Marie Leiden, the school's first assistant principal.

As the first diocesan coeducational high school in Pittsburgh, Seton LaSalle was originally established to serve the parishes of the South Hills. However, in the decades that followed, the school has attracted a growing community with some of the brightest and most talented students in the region. 

Blessed with a long tradition of excellence, today we are one of the most diverse and inclusive student bodies in the entire region. Our students enjoy the energy and enthusiasm of our community, and our commitment to shared success that makes an education at Seton LaSalle a life-building experience unlike any other. 

Coat Of Arms

The Coat of Arms of Seton LaSalle Catholic High School, which signifies it as an institution of the Roman Catholic Diocese of Pittsburgh, and a merger of the former Elizabeth Seton High School for Girls and the former South Hills Catholic High School for Boys, is composed of the shield and its charges surmounted by a cross and the motto beneath the shield. The heraldic shield is divided into three parts. The left partition is a replica of the shield of the coat of arms of the Diocese of Pittsburgh, which is based on the coat of arms of William Penn, the founder of Pennsylvania, and of William Pitt, for whom Pittsburgh is named. It is described as being “argent” (silver), on a fess (horizontal band) sable (the color black—represented in heraldic engraving by crossing vertical and horizontal lines to produce dark shading). The blue and silver checkered fess also appears in the shield of the City of Pittsburgh and appeared in the shield of the former South Hills Catholic High School. To differentiate the diocesan coat of arms, a sword of gold (designated in heraldic engraving by speckling) has been added. The sword is used in Christian art as the symbol of Saint Paul the Apostle, the patron of the Diocese. The two rounded gold crosses are a Christianized version of plates found on Penn’s coat of arms. The entire left partition expresses the jurisdiction of the Diocese of Pittsburgh.

The right partition displays an upper half blue field (background), designated in heraldic engraving by horizontal lines, with a silver star and two gold broken chevrons. The star is taken from the seal of the Institute of the Brothers of the Christian Schools and also appeared on the shield of South Hills Catholic. This seal, which can be traced back as far as the Brothers’ General Chapter of 1751, recalls the Old Testament passage in the Book of Daniel (12:8) which says, “They that instruct many unto justice, shall shine as stars for all eternity.” The two gold broken chevrons are taken from the coat of arms of the House of De LaSalle, the Spanish ancestors of Saint John Baptist de LaSalle, the Founder of the Christian Brothers, and patron of teachers.

The lower half of the right partition depicts three crescents of red (designated in heraldic engraving by vertical lines), on a field of gold. These are the traditional arms of the Seton Family of Scotland, and appeared in the lower right partition of the shield of Elizabeth Seton High School. The Seton Family was famous in the Catholic history of Scotland and it was into this illustrious family that Saint Elizabeth Ann (Bayley) married and brought new luster to this noble name, when she founded the American Sisters of Charity.

A graceful, dignified, single-traversed cross containing the school’s colors of green and gold, surmounts the entire shield, symbolizing the Christian principles taught at Seton LaSalle Catholic High School.

The school motto, “In Fide et Caritate” which translates as, “In Faith and Charity” recalls the supporting spirits of the two religious congregations which established the school. The motto also expresses a program of life, an ideal, and the spirit of the bearer of its arms.