St. Mary's High School is a private, Catholic high school in Storm Lake, Iowa. It is located in the Diocese of Sioux City.
Located three blocks from the waterfront of Storm Lake, the school offers a quality, faith-based education. The school opened in 1912 as an elementary school, and it was expanded to house Pre-K through 12th Grade in August 1967.
The Panthers compete in the Twin Lakes Conference in the following sports:
The Panthers also combine their sports and compete with Storm Lake Public High School for Wrestling, Cross-Country, and Football baseball at the high school level. Storm Lake High School competes in the 3A division of Iowa Athletics.