Konstanz, also written as Constance in English, is a university city with approximately 83,000 inhabitants located at the western end of Lake Constance in the south of Germany. The city houses the University of Konstanz and was the residence of the Roman Catholic Diocese of Konstanz for more than 1,200 years.

The city is located in the state of Baden-Wörttemberg and situated at the banks of Lake Constance (Bodensee in German). The river Rhine, which starts in the Swiss Alps, passes through Lake Constance and leaves it, considerably larger, by flowing under a bridge connecting the two parts of the city. North of the river lies the larger part of the city with residential areas, industrial estates, and the University of Konstanz; while south of the river is the old town, which houses the administrative centre and shopping facilities in addition to the Hochschule or the University of Applied Sciences. Car ferries provide access across Lake Constance to Meersburg, and the Katamaran provides a shuttle service for pedestrians to Friedrichshafen. The Germany–Switzerland border runs along the southwestern and southern edge of the city. Adjacent to it is the town of Kreuzlingen.

Main sights include:

• Archaeological Museum
• Imperia, a 9 m-tall sculpture
• Jan Hus Museum
• Konstanz Cathedral
• Konzil edifice, dating to the 15th century
• Niederburg (Lower Castle)
• Petershausen Abbey
• Remains of a Roman fortress, near the Cathedral
• Schnetztor, fortified gate of the former city walls

Konstanz was also home to a large synagogue, destroyed by the Nazi government in 1938.