| Conflict: | Battle of Piatka |
| Partof: | Kosiński Uprising |
| Date: | February 2, 1593 |
| Place: | Piatka, in modern Zhytomyr Oblast, Ukraine |
| Result: | Polish-Lithuanian victory |
| Combatant1: | Polish–Lithuanian Commonwealth |
| Combatant2: | insurgent Cossacks |
| Commander1: | Janusz Ostrogski, Aleksander Wiśniowiecki |
| Commander2: | Krzysztof Kosiński |
| Strength1: | Pospolite ruszenie of the voivodships: Kiev, Bratslav, Volhynian, private troops of Prince Janusz Ostrogski |
| Strength2: | 5,000 Cossacks, 26 cannons |
| Casualties1: | Very light |
| Casualties2: | to 3,000 killed, 26 cannons |
Battle of Piatka or Battle of Piątek (Ukrainian: П'ятка, Polish: Piątka, Piątek), (February 2, 1593) took place during the Kosiński Uprising. Polish–Lithuanian Commonwealth forces under the command of Janusz Ostrogski defeated the Cossacks forces under the command of Krzysztof Kosiński.