Marian High School (also known as Mishawaka Marian) is a Roman Catholic secondary school in Mishawaka, Indiana, in the United States, operated by the Roman Catholic Diocese of Fort Wayne-South Bend.

Marian High School holds a First Class commission from the Indiana State Department of Education and has been accredited by the North Central Association since early 1996.

In addition, Marian offers ACP(Advanced College Project) classes through Indiana University South Bend and non-AP dual credit courses through Ivy Tech Community College.

These include Biology, Chemistry, Physics, U.S. History, Cadet Teaching, English, and Calculus.

The band performs during athletic events, as well as holding both a Christmas and Spring concert annually.