The Battle of Żownin (or Żołnin) was an engagement between the Polish-Lithuanian Commonwealth forces under hetman Mikołaj Potocki, supported by the forces under magnate Jeremi Wiśniowiecki, and Cossacks commanded by Yakiv Ostranin (Jakub Ostrzanin) and Dmytro Hunia during the Ostrzanin Uprising in Summer 1638. After a prolonged siege, the Cossacks were defeated and surrendered to the Commonwealth forces.