Marion Catholic High School (sometimes referred to as Marion Catholic Junior/Senior Preparatory High School) was a private, Catholic high school in Marion, Ohio, United States that was established in 1879 by three sisters from the Sisters of Charity.

In March 2013, it was announced by Bishop Frederick F. Campbell that Marion Catholic would close following the 2012–13 school year due to declining enrollment and financial concerns.

[2] The building was listed on the National Register of Historic Places in 2017.

The Marion Catholic Fighting Irish participated in the Northwest Central Conference.

This Marion County, Ohio school-related article is a stub.