Lehman Catholic High School is a private co-educational high school located in Sidney, Ohio, United States. It is owned and operated by the Roman Catholic Archdiocese of Cincinnati and served by the Sisters of Charity of Cincinnati. The school is named after Edward C. Lehman, who served as pastor of Holy Angels Parish for 34 years and oversaw the construction of Holy Angels High School. Lehman Catholic was established in 1970 as a result of the consolidation of Holy Angels High School, established in 1889, and Piqua Catholic High School, established in 1924. The school's colors are royal blue and gold and athletic teams are known as the Cavaliers. As of 2022, the principal is Veronica Gaier.