Towson Catholic High School was a private Catholic, co-educational high school in the Baltimore suburb of Towson, Maryland, whose closing was announced in July, 2009. At its peak enrollment in the 1960s and 1970s, more than 400 children attended. Founded in 1922 by a Catholic priest, Phillip Sheridan, it was the oldest co-educational Catholic high school in the Roman Catholic Archdiocese of Baltimore when it closed.