Aarhus Katedralskole is a cathedral school, an institution of secondary education, a Danish Gymnasium and a listed building in Aarhus, Denmark. The school is situated in the neighborhood Midtbyen, in the Latin Quarter, bounded by the streets Mejlgade, Kystvejen and Skolegyde. Aarhus Katedralskole offers the 3 year Matriculation examination (STX) programme with elective subjects in the natural sciences, social sciences and arts. The school is an independent self-owning institution financed by the Danish state with about 800 students divided across 30 classes.

Cathedral schools began in the Early Middle Ages as centers of advanced education, some of them ultimately evolving into medieval universities. Throughout the Middle Ages and beyond, they were complemented by the monastic schools. Some of these early cathedral schools, and more recent foundations, continued into modern times.