La diocesi di Szombathely è una sede della Chiesa cattolica in Ungheria suffraganea dell'arcidiocesi di Veszprém. Nel 2017 contava 216.302 battezzati su 297.375 abitanti. È retta dal vescovo János Székely.
The Our Lady of the Visitation Cathedral also called Szombathely Cathedral or Cathedral of the Visitation of Our Lady is the name given to a religious building affiliated with the Catholic Church in the city of Szombathely in Hungary, it is the principal church of the Diocese of Szombathely.
With the establishment of a diocese in 1777 the construction of a cathedral became necessary. A Baroque building in classical style began in 1791 and was completed in 1797. However, the interior work continued until 1814. The Cathedral of the Visitation is located in the ancient forum of the Roman city of Savaria. Melchior Hefele architect was responsible for the plans.
