The battle of Frisches Haff or battle of Neuwarp was a naval battle between Sweden and Prussia that takes place on September 10, 1759, as part of the ongoing Seven Years' War.

The battle takes place in the Oder Lagoon (German: Oderhaff) between Neuwarp and Usedom, and is named after an ambiguous earlier name for the Lagoon, Frisches Haff, which later exclusively denotes the Vistula Lagoon.

Swedish naval forces consisting of twenty-eight vessels and twenty-two hundred and fifty men under Captain Lieutenant Carl Rutensparre and Wilhelm von Carpelan destroy a Prussian force of thirteen vessels and seven hundredmen under captain von Köller.

The consequence of the battle was that the small fleet Prussia had at its disposal ceased to exist. The loss of naval supremacy meant also that the Prussian positions at Usedom and Wollin became untenable and were occupied by Swedish troops.