The Battle of Oliwa, also known as the Battle of Oliva or the Battle of Gdask Roadstead, was a naval battle that took place on 28 November, 1627, slightly north of the port of Danzig off of the coast of the village of Oliva during the PolishSwedish War. It was the largest naval engagement to be fought by the PolishLithuanian Commonwealth Navy and resulted in defeating a Swedish squadron led by Niels Stiernskld that conducted a blockade of the harbour of Danzig. The Poles sailed out of the Danzig harbour and engaged the Swedish squadron capturing the Swedish flagship and sinking another Swedish warship.:110

Polish–Lithuanian Commonwealth Navy was the navy of the Polish–Lithuanian Commonwealth.