The 1659 Battle of Grudziądz took place in the Polish town of Grudziądz () during the Swedish Deluge (), around 29–30 August 1659. Polish forces were commanded either by hetman Jerzy Sebastian Lubomirski or general Krzysztof Grodzicki (sources vary). The battle ended with the Polish victory, after a week-long siege; however much of the city was destroyed in a fire.