Wojciech Kętrzyński (born Adalbert von Winkler; 11 July 1838 – 15 January 1918), was a Polish historian and the director of the Ossolineum Library in Lemberg, then the capital of Galicia, Austrian Empire. He focused on Polish history at a time when Poland was partitioned between foreign powers. He opposed the idea of Germanization and assisted in the January Uprising for Poland's cause. In 1861 he legally changed his name and became a Polish national.