The Bishop Preses, currently Olav Fykse Tveit is also based at the Nidaros Cathedral.

While the Bishop Preses holds episcopal responsibility within the Nidaros domprosti (deanery) in Trondheim, the Bishop of Nidaros holds episcopal authority of the other eight deaneries as well as the language based parish of the Southern Sámi.

It originally covered the (modern) counties of Trøndelag, Nordland, Troms, and Finnmark, along with the regions of Nordmøre and Romsdal (in Møre og Romsdal county) and Härjedalen (in Sweden), and also the northern part of Østerdalen (Tynset, Tolga, and Os).

The region of Sunnmøre (in Møre og Romsdal) was transferred from Diocese of Bjørgvin to the new Archdiocese of Nidaros some time after 1152 – to secure it more income.

In addition, the Parish of the Southern Sámi language area fall under the Bishop of Nidaros authority, while the Trondheim parish of the Deaf is pastored by the Deanery of Church of the Deaf and the Bishop of Oslo.