Reitz Memorial High School or simply Memorial High School (MHS), is an inter-parochial Catholic High School on the east side Evansville, Indiana. It sits on a 13-acre (53,000 m2) tract of land off Lincoln Avenue that was bought with money donated by Francis Joseph Reitz in 1922 in memory of his parents John Augustus and Gertrude Reitz . The school officially opened its doors on January 5, 1925. It is part of the Roman Catholic Diocese of Evansville. The IHSAA uses Evansville Memorial High School instead of Reitz Memorial High School mainly to distinguish the school from the older public Reitz High School on Evansville's west side, both of which are named in honor of Francis Joseph Reitz.