Maryland Public Secondary Schools Athletic Association (MPSSAA) is the association that oversees public high school sporting contests in the state of Maryland. Organized after World War II in 1946, the MPSSAA is made up of public high schools from each of Maryland's 23 counties and independent city of Baltimore, which joined the association in 1993 when its public high schools withdrew from the earlier longtime athletic league, the Maryland Scholastic Association (MSA) which was founded in 1919. The MSA had been composed of public high schools in Baltimore and private/religious/independent schools on the secondary level in Baltimore and its metropolitan area and the surrounding central Maryland region. It was one of the few state-level interscholastic athletic leagues in the nation composed of both public and private/religious/independent secondary schools. After the Baltimore City public high schools withdrew from the MSA, the remaining private/religious/independent schools conferred and organized two parallel regional/state-wide athletic leagues with sports competition and exercise activities with one for young men and the other for young women. These were the Maryland Interscholastic Athletic Association and the Interscholastic Athletic Association of Maryland, which still exist today. All three state-wide athletic leagues, two for private/religious/independent secondary schools and one for co-ed public high schools exist today marrying on the proud traditions, memories and championships of the old Maryland Scholastic Association (MSA)—one of the oldest state athletic leagues for secondary schools in the country.

The National Federation of State High School Associations (NFHS) is the body that writes the rules of competition for most high school sports and activities in the United States. NFHS's headquarters are located in White River State Park in Indianapolis, Indiana.