Joanna Grudzińska (17 May 1791, Poznań - 17 November 1831, Tsarskoye Selo) was a Polish noble, a Princess of Łowicz and the second wife of Grand Duke Constantine Pavlovich of Russia, the de facto viceroy of the Kingdom of Poland.
Joanna Grudzińska (17 May 1791, Poznań - 17 November 1831, Tsarskoye Selo) was a Polish aristocrat and Princess of Łowicz who married Grand Duke Constantine Pavlovich of Russia, effectively governing the Kingdom of Poland.