Greifswald (German pronunciation: [ˈɡʁaɪfsvalt]), officially, the University and Hanseatic City of Greifswald (in German Universitäts- und Hansestadt Greifswald) is a town in northeastern Germany. It is situated in the state of Mecklenburg-Vorpommern, at an equal distance of about 250 kilometres (160 mi) from Germany's two largest cities, Berlin and Hamburg. The town borders the Baltic Sea, and is crossed by a small river, the Ryck. It is also located near Germany's two largest islands, Rügen and Usedom as well as near three of the country's 14 national parks. A former district-free town, it is the capital of the new district of Vorpommern-Greifswald since the September 2011 district reforms.

The city's population is about 55,000, including most of its 12,500 students and 5,000 employees of the University of Greifswald. Greifswald is internationally known due to the university and the Nord Stream gas pipeline project.

Greifswald is located in the northeast of Germany, approximately equidistant from Germany's two largest islands, Rügen and Usedom. The town is situated at the south end of the Bay of Greifswald, the historic centre being about 5 kilometres (3.1 mi) up the river Ryck that crosses the town. The area around Greifswald is mainly flat, and hardly reaches more than 20 metres above sea level. Two islands, Koos and Riems, are also part of Greifswald. Three of Germany's fourteen national parks can be reached by car in one hour or less from Greifswald.