Nidaros Cathedral (Norwegian: Nidarosdomen / Nidaros Domkirke) is a church located in the city of Trondheim in Sør-Trøndelag county, Norway. It was the cathedral of the Norwegian archdiocese, from its establishment in 1152 until its abolition in 1537. Since the Reformation, it has been the cathedral of the Lutheran bishops of Trondheim (or Nidaros) in the Diocese of Nidaros. The architectural style of the cathedral is Romanesque and Gothic. Historically it was an important destination for pilgrims coming from all of Northern Europe.
Along with Vår Frue Church, the cathedral is part of the Nidaros og Vår Frue parish in the Nidaros deanery in the Diocese of Nidaros.