Schola Osloensis, known in Norwegian as Oslo Katedralskole (Oslo Cathedral School) and more commonly as "Katta", is a selective upper secondary school located in Oslo, Norway. The school offers the college preparatory Studiespesialisering (literal translation: specialization for studies) of the Norwegian school system. Oslo Cathedral School is one of four schools in Norway that can trace its origins directly to the Middle Ages. It is generally regarded as one of Norway's most prestigious schools, which celebrated its 850th anniversary in 2003.