St. Michael the Archangel High School is a private, Roman Catholic high school in Shenandoah, a census-designated place in unincorporated East Baton Rouge Parish, Louisiana, United States, east of the city of Baton Rouge.

[2][3] It is located in the Roman Catholic Diocese of Baton Rouge.

[4] Established in 1984 by the Catholic Diocese of Baton Rouge as Bishop Joseph V. Sullivan Diocesan Regional High School, the name was changed to St. Michael the Archangel Diocesan Regional High School in 2005 due to sexual abuse allegations against its namesake —— Bishop Joseph Sullivan.

Staffed by a faculty of religious laymen and women, the school is accredited by the Louisiana State Board of Elementary & Secondary education and by the Southern Association of Colleges and Schools.

Operational guidelines are based on the administrator’s handbook for the State of Louisiana.