Katedralskolan is a school in Uppsala, Sweden. The school was established in 1246. It is the oldest educational institution in Uppsala, and one of the oldest in Sweden.
A school administered by the Cathedral existed before the year 1300; originally, this school was a seminary for clergy and other church functionaries.Until 1869, the school was located in various buildings next to the cathedral, but in that year it moved to its current location. Several new buildings have been added to the original school building.
Katedralskolan is a gymnasium school with around 1200 students. Traditionally, Katedralskolan has focused on theoretical education within the humanities and natural sciences, but it also offers programmes within subjects such as child care.The school offers the International Baccalaureate Diploma Programme, as well as advanced programmes within German, French or Spanish.