Our Lady of the Sacred Heart High School is a private Catholic high school in Moon Township, Pennsylvania. Located in the Roman Catholic Diocese of Pittsburgh, it is a ministry of the Felician Sisters. Among students and in colloquial terms, it is referred to as OLSH. The students who attend the school refer to themselves as "OLSHies", "OLSHians",or "OLSHines".
In 1970, with the permission of the diocese of Pittsburgh and the approval of the administration of the Felician Sisters, the first boys were admitted to OLSH. The years that followed have seen a steady increase in numbers and in programs and activities for both young men and women at OLSH.
In 1979, the Supreme Court decision upholding free transportation for non-public school students is significant in the history of the school in that it has broadened the recruitment base of the school. Currently students from 21 different school districts come together to form the OLSH community.