Tadeusz Kossak (1 January 1857 in Paris – 3 July 1935 in Poland), was born into a noted Polish family of artists and writers. He was an officer in the Polish Army, a freedom fighter, and owner of a country estate in Górki Wielkie, that became a mecca for intellectuals of the era. He was the father of writer, and World War II actvist and resistance fighter, Zofia Kossak-Szczucka.
He was the son of the celebrated painter, Juliusz Kossak and twin of another noted painter, Wojciech Kossak. After the family's return to Poland from France, where he was born, Kossak attended school first in Warsaw and later in Kraków. He came to prominence in 1907 when he was arrested for political activism against the Imperial Russian authorities and the foreign occupation of Poland. During World War I, in 1917, he joined the Polish Corps of Józef Dowbor-Muśnicki fighting for Polish independence.
In 1922 with his wife, Anna née Kisielnicka, he moved from Kresy Wschodnie in Eastern Poland to Górki Wielkie near Cieszyn in Silesia. There they bought a country estate where they hosted many intellectuals of the period, including, Jan Parandowski, Maria Dąbrowska, Jan Sztaudynger, Melchior Wańkowicz, Wojciech Kossak, Maria Pawlikowska-Jasnorzewska, Magdalena Samozwaniec, Jadwiga Witkiewicz and her husband, Stanisław Ignacy Witkiewicz.