Stralsund, officially the Hanseatic City of Stralsund, is a city in the Pomeranian part of Mecklenburg-Vorpommern, Germany. It is located at the southern coast of the Strelasund, a sound of the Baltic Sea separating the island of Rügen from the mainland.

The Strelasund Crossing with its two bridges and several ferry services connects Stralsund with Rügen. The Western Pomeranian city has been the capital of the Vorpommern-Rügen district since the 2011 district reforms. It is the fourth-largest city of Mecklenburg-Vorpommern and, together with Greifswald, Stralsund forms an Oberzentrum, one of four high-level urban centers of the region.

Stralsund was granted city rights in 1234 and was one of the most prospering members of the medieval Hanseatic League. In 1628, during the Thirty Years' War, the city came under Swedish rule and remained so until the upheavals of the Napoleonic Wars. From 1815 to 1945, Stralsund was part of Prussia. Since 2002, Stralsund's old town with its rich heritage is honored as a UNESCO World Heritage, along with Wismar in Mecklenburg.

The main industries of Stralsund are shipyards, fishing, mechanical engineering, and, to an increasing degree, tourism, life sciences, services and high tech industries, especially information technology and biotechnology.

The city lies on the sound of Strelasund, a strait of the Baltic Sea. Its geographic proximity to the island of Rügen, whose only fixed link to the mainland, the Strelasund Crossing, runs between Stralsund and the village of Altefahr, has given Stralsund the sobriquet "Gateway to the Island of Rügen" (Tor zur Insel Rügen). Stralsund is located close to the Western Pomerania Lagoon Area National Park.

Stralsund's city borough includes municipal forest and three municipal ponds (the Knieperteich, Frankenteich and Moorteich. The three ponds and the Strelasund lend the Old Town, the original settlement site and historic center of the city, a protected island ambience. The highest point of the city is the Galgenberg ("Gallows Hill") on its western approaches.