Jan Czeczot of Ostoja (Belarusian: Ян Чачот, Jan Čačot, 1796–1847) was a noble of the Polish-Lithuanian Commonwealth of Belarusian origin, romantic poet and ethnographer. Fascinated by folk lore and traditional folk songs of the former Grand Duchy of Lithuania, confederal part of 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 Belarusian national revival.