The Diocese of Sisak (Croatian: Sisačka biskupija; Latin: Dioecesis Sisciensis) is a Latin Church diocese in the Sisak-Moslavina region, Croatia.
It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Zagreb.
Križa, dedicated to Exaltation of the Holy Cross, in the episcopal see of Sisak, which also has a minor basilica: Bazilika Sv.
Kvirina, dedicated to saint and martyr Quirinus of Sescia, the first bishop of the diocese.
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