Aleksander Brückner (Polish pronunciation: [alɛkˈsandɛr ˈbryknɛr]; 29 January 1856 – 24 May 1939) was a Polish scholar of Slavic languages and literatures (Slavistics), philologist, lexicographer and historian of literature. He is among the most notable Slavicists of the late 19th and early 20th centuries, and the first to prepare complete monographs on the history of Polish language and culture. He published more than 1,500 titles and discovered the oldest extant prose text in Polish (the Holy Cross Sermons).