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| Ostryanyn uprising Повстання Острянина | |||||||
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 Yakiv Ostryanyn | |||||||
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| Belligerents | |||||||
 Polish–Lithuanian Commonwealth |
 Ukrainian Cossacks | ||||||
| Commanders and leaders | |||||||
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Mikołaj Potocki Jeremi Wiśniowiecki |
Yakiv Ostryanyn Dmytro Hunia | ||||||
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| Cossacks |
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The Ostryanyn uprising (Ukrainian: Повстання Острянина) was a 1638 Cossack uprising against the Polish–Lithuanian Commonwealth. It was sparked by an act of the Sejm (legislature) passed the same year that declared that non-Registered Cossacks were equal to ordinary peasants in their rights, and hence were subjected to enserfment. The uprising was initially led by Cossack Hetman Yakiv Ostryanyn (Polish: Jakub Ostrzanin) but was eventually crushed.