This article is about the 1773–1775 Sejm. You may also be looking for the 1793 Grodno Sejm.

The Partition Sejm was a Sejm lasting from 1773 to 1775 in the Polish-Lithuanian Commonwealth, convened by its three neighbours (the Russian Empire, Prussia and Austria) in order to legalize their First Partition of Poland. During its first days in session, that Sejm was the site of Tadeusz Rejtan's famous gesture of protest against Partition. The Sejm also passed other legislation, notably establishing the Permanent Council and the Commission of National Education. Cardinal Laws were confirmed.