thumb|300px|Stanisław and Konstancja Poniatowski
Princess Konstancja Czartoryska (c. 1696 or 29 January 1700 – 27 October 1759) was a Polish-Lithuanian noblewoman and the mother of King Stanisław II August of Poland. She played a political role as a driving force within the Familia (political party).
Life
She was the daughter of magnate Prince Kazimierz Czartoryski and his wife, Izabela Elżbieta Morsztyn. She was given a fashionable French-influenced education. She married Stanisław Poniatowski on 14 September 1720.