The Battle of Kay, also referred to as the Battle of Sulechów, Battle of Züllichau, or Battle of Paltzig, is an engagement fought on July 23, 1759, during the Seven Years' War. It occurred near Kay (Kije) in the Neumark, now part of Poland.

General Carl Heinrich von Wedel, the commander of the Prussian army of twenty-six thousand men, unwisely attacked a larger Russian army of forty-one thousand men commanded by Count Pyotr Saltykov.

The Prussians lose eighty-three hundred men; the Russians lose less than five thousand men.

After the battle, King Frederick II of Prussia is determined to force the Russians into a decisive engagement in order to prevent them joining up with the main Austrian army.

Three weeks later, the Prussians meet the combined Russian-Austrian army at Kunersdorf.