Kossakowski () was an aristocratic family of Mazovian origin.
They were first mentioned in the 13th century and initially settled in Ciechanów County, from where they branched out to the Grand Duchy of Lithuania, Podolia, Volhynia, and Livonia.
Coat of arms
Coat of arms of the Kossakowski family was Ślepowron.
Famous members
Jan Nepomucen Kossakowski (1755–1808), bishop of Inflanty and later of Vilna
Józef Dominik Kossakowski (1771–1840), colonel, member of the Targowica Confederation, son-in-law of Stanisław Szczęsny Potocki Józef Kossakowski (1772–1842), general of French army, aide-de-camp of Napoleon Józef Kazimierz Kossakowski (1738–1794), bishop of Inflanty, a member of the Targowica Confederation Józef Kossakowski (1807–1857), printer in Lublin Józef Ignacy Kossakowski (1757–1829), political and educational activist Szymon Marcin Kossakowski (1741–1794) one of the leaders of the Targowica Confederation and the last Great Hetman of Lithuania. Jan Kossakowski (died 1680) member of the Sejm Antoni Kossakowski (1718–1786) – poet Michał Kossakowski (1733–1798) – voivode of Witebsk and Bracław Voivodeship Antoni Kossakowski (1735–1798) – castelan in Livonia Jakub Kossakowski (1752–1784) – podstoli of Kowno Jan Nepomucen Kossakowski (1755–1808) – bishop of Inflanty and Wilno Adam Kossakowski (1756–1828) – auxiliary bishop of Inflanty and Wilno, Jesuit Jarosław Michał Kossakowski (1842–1889) – participated in the January Uprising Michał Stanisław Kossakowski (1883–1962) – landowner, diplomat, banker Jan Kossakowski (1900–1979) – physician, surgeon Józef Kossakowski (1917–1988) – ichthyologist Eustachy Kossakowski (1925–2001) – photographer Zofia Kossakowska (born 1924) – art historian Barbara Kossakowska (1927–2007) – architect Andrzej Kossakowski (1929–1992) – art historian Jerzy Kossakowski (born 1952) – member of the Sejm Grzegorz Kossakowski, Polish bobsledder