Zebrzydowski's rebellion (Polish: rokosz Zebrzydowskiego), or the Sandomierz rebellion (Polish: rokosz sandomierski), was a rokosz (semi-legal rebellion) in the Polish–Lithuanian Commonwealth against King Sigismund III Vasa. The rokosz, formed on 5 August 1606 by Mikołaj Zebrzydowski, Jan Szczęsny Herburt, Stanisław Stadnicki, Aleksander Józef Lisowski and Janusz Radziwiłł in Stężyca and Lublin, was caused by the growing dissatisfaction with the King among the nobility (the szlachta). In particular, the rebels disapproved of the King's efforts to limit the power of the nobles, his attempts to weaken the Sejm (the Polish parliament) and to introduce a hereditary monarchy in place of the elective one. The rebellion (1606–1608) ended in the defeat of the rebels. Despite the failure to overthrow the King, the rebellion firmly established the dominance of the szlachta over the monarch in the Polish–Lithuanian political system.
The Polish nobles gathered at the rokosz formed a konfederacja and outlined their demands in 67 articles. They demanded Sigismund III's dethronement for breaching the Henrician Articles, and the expulsion of the Jesuits from the Polish–Lithuanian Commonwealth. They further demanded that the Sejm appoint state officials instead of the king; that local officials should be elected and not appointed and that Protestant's rights should be expanded and protected.