Lehman Catholic High School is a co-educational, Roman Catholic high School owned and operated by the Archdiocese of Cincinnati and located in Sidney, Ohio. The school history dates back to 1889 as Holy Angels High School, and the current school was named after the Right Reverend Monsignor Edward C. Lehman during the 1970 consolidation of Holy Angels and Piqua Catholic High Schools. The Sisters of Charity of Cincinnati have served the school since 1889.