Jan Czeczot of Ostoja (Lithuanian: Jonas Čečiotas, Belarusian: Ян Чачот, Jan Čačot, 1796–1847) was a Polish romantic poet and ethnographer. Fascinated by the folklore and the traditional folk songs of the former Grand Duchy of Lithuania, a confederal part of the Polish–Lithuanian Commonwealth, he recollected hundreds of them in his works. Inspired by them, he also wrote several poems in what could be considered a pre-modern Belarusian language. As such, he is often cited as one of the first Polish ethnographers and one of the predecessors of the Belarusian national revival.