The siege of Stralsund was a siege laid on Stralsund by Albrecht von Wallenstein's Imperial Army during the Thirty Years' War, from 13 May 1628 to 4 August 1628. Stralsund was aided by Denmark and Sweden, with considerable Scottish participation. The lifting of the siege ended Wallenstein's series of victories, and contributed to his downfall. The Swedish garrison in Stralsund was the first on German soil in history. The battle marked the de facto entrance of Sweden into the war.

Stralsund, officially the Hanseatic City of Stralsund, is the fifth-largest city in the northeastern German federal state of Mecklenburg-Western Pomerania after Rostock, Schwerin, Neubrandenburg and Greifswald, and the second-largest city in the Pomeranian part of the state. It is located on the southern coast of the Strelasund, a sound of the Baltic Sea separating the island of Rügen from the Pomeranian mainland.