Count Józef Kajetan Ossoliński (1758[1]–15 April 1834[2]) was a notable Polish szlachcic (nobleman) with a distinguished political career.

Additionally, he held the position of Starost of Sandomierz starting in 1781.

Ossoliński was active in politics throughout his life, participating as a representative from the Drohiczyn region in various parliamentary sessions, including the Four-Year Sejm and the Targowica Confederation.

Over his lifetime, he was married twice and had three children, including a daughter and a son who continued the family legacy.

[4] He also gained recognition as a collector of art, creating a gallery in his palace in Warsaw, which housed works acquired from King Stanisław August Poniatowski.