Princess Konstancja Poniatowska (1759–1830) was a Polish noblewoman from the House of Poniatowski.

Konstancja Poniatowska was born on March 2, 1759 in Warsaw, Poland.

She was the only daughter of Kazimierz Poniatowski and his wife; Apolonia Ustrzycka.

Konstancja later married Ludwik Skumin Tyszkiewicz on April 4, 1775.

[1] Konstancja was a close friend of the French Minister of Foreign Affairs, Charles Maurice de Talleyrand-Périgord.