Katarina Branković (Serbian Cyrillic: Катарина Бранковић, Greek: Καταρίνα Μπράνκοβιτς; 1418/19–1492), also known as Kantakuzina (Кантакузина, Kantakouzena) was the Countess of Celje, through the marriage with Count of Celje Ulrich II. A Serbian princess, she was the daughter of Despot Đurađ Branković and Byzantine princess Irene Kantakouzene. She is remembered for writing the Varaždin Apostol (1454), and her endowment of the Rmanj Monastery.