The Greek Catholic Co-cathedral of Saints Cyril and Methodius (Croatian: Grkokatolička konkatedrala Sv.

Ćirila i Metoda) is the historicistic co-cathedral church of the Greek Catholic Eparchy of Križevci.

It is located in the Street of St. Cyril and Methodius on the Upper Town in Zagreb, near St. Mark's Square.

A Greek Catholic church and seminary (built in 1681) existed on the Upper Town before the 17th century.

This church was intended for the Greek Catholic believers, mostly people from Žumberak Mountains, Uskoks and clerics that lived in and around Zagreb.