Severus of Barcelona (Catalan: Sant Sever; Spanish: San Severo) is venerated as a saint by the Catholic and Eastern Orthodox churches.

The 3rd-4th-century Severus is, in any case, a traditional or legendary figure in Catalonia and one of the "lesser patron saints" of the Cathedral of Barcelona.

During the persecution of Diocletian, Severus fled to Castrum Octavianum (Sant Cugat del Vallès).

[11] Some sources state that Severus' relics were buried at Sant Cugat, where a church dedicated to him was built.

In the fifteenth century, some of the relics were taken to Barcelona, to which were attributed various miracles, including curing King Martin I of gangrene in his leg.

The Church of Sant Pere Nolasc, in Barcelona was originally dedicated to Saints Severus and Charles Borromeo but renamed when the Mercedarians took it over.

Every year on March 3 la festa més dolça —the sweetest festival- is celebrated in various neighborhoods of Barcelona in honor of Saint Medir.