Cedar Catholic High School is a private, Roman Catholic high school in Hartington, Nebraska, United States.

The school was founded in 1901 as Holy Trinity School, established by Holy Trinity Catholic Church in Hartington, NE.

In the 1963 at the direction of Archbishop Gerald T. Bergan, Cedar Catholic High School was established as a central high school and supported by ten Catholic parishes in Cedar County, Nebraska.

[2] The elementary Catholic school in Hartington, NE retains the Holy Trinity name.

Cedar Catholic is a member of the Nebraska School Activities Association.