Citadel High School is a high school in Halifax, Nova Scotia, Canada. The school opened in September 2007 on the site of the former Bell Road Campus of the Nova Scotia Community College. Its location bordering Bell Road, Trollope Street, and Ahern Avenue is adjacent to the Halifax Common and immediately west of Citadel Hill, a National Historic Site from which the school derives its name. Citadel High School was formed from a merger of two older schools: Queen Elizabeth High School and Saint Patrick's High School, opened in 1942 and 1954 respectively.