Princess Katarzyna Ostrogska (1602–1642) was a Polish–Lithuanian noblewoman, founder of the city of Biała (modern Janów Lubelski).

[1] She was the daughter of voivode of Wołyń Prince Oleksander Ostrogski h. Ostrozky, and Anna Kostka h. Dąbrowa.

She married voivode of Podole and Kijów (Kyiv, also Kiev) Chancellor Tomasz Zamoyski h. Jelita.

She became the mother of Jan "Sobiepan" Zamoyski (1627-1665), voivode of Kijów and Sandomierz (married Marie Casimire Louise de La Grange d'Arquien, the later consort to King John III Sobieski), Gryzelda Konstancja Zamoyska (1623-1672), mother of King Michał Korybut Wiśniowiecki, and Joanna Barbara Zamoyska (1626-1653).

21 July 1640, the king granted her the privilege to found the city of Biała.