Coordinates: 58°24′57″N 15°36′57″E / 58.415808°N 15.615778°E
Katedralskolan (literally The Cathedral School), in Linköping, Sweden, is a secondary school, run by Linköping Municipality, which offers Swedish programmes in social sciences and natural sciences as well as (since 2001) the International Baccalaureate Diploma Programme.
Founded in 1627, it is the third oldest gymnasium in Sweden, after the Rudbeckianska gymnasiet in Västerås and Thomasgymnasiet in Strängnäs. Its name comes from its proximity to Linköping Cathedral.
The current building, finalised in 1914, underwent renovation in 1999. The school has a reputation for its assembly hall, which features wall paintings of Gustav II Adolf, king at the time of the school's foundation, and of Aristotle.
Katedralskolan is proud of its traditions but seeks to stay up to date, as reflected in its motto: "tradition and development". Its affinity for tradition is evident in its logo which says Gymnasium Lincopense, the Latin name used at the time when Katedralskolan was the only school in Linköping.