Princess Katarzyna Ostrogska (, ) (1560âÂÂ1579) was a Ruthenian noblewoman. She is renowned for the 1577 Siege of Dubno, during which nomads laid siege to the city with the intention of capturing her.
She was the second of four wives of Krzysztof Mikoà Âaj Radziwià Âà Â, whom she married on 22 July 1578 in Dubno.