The Old Cathedral, also called the Church of Ignatius or the Jesuit Church, is a church in Linz, Austria. It was built between 1669 and 1683 in Baroque style. From 1785 to 1909 it served as cathedral of the Diocese of Linz.

Linz is the capital of Upper Austria and third-largest city in Austria. Sitting on the river Danube, the city is located in the far north of Austria, 30 km (19 mi) south of the border with the Czech Republic. As of 1. January 2024, the city has a population of 212.538 and is the 7th largest of all cities on the Danube river.