The City Municipality of Bremen (German: Stadtgemeinde Bremen, German pronunciation: [ˈbʁeːmən] ( listen)) is a Hanseatic city in northwestern Germany. A commercial and industrial city with a major port on the River Weser, Bremen is part of the Bremen-Oldenburg metropolitan area (2.4 million people). Bremen is the second most populous city in Northern Germany and tenth in Germany.

Bremen is some 60 km (37 mi) south from the Weser mouth on the North Sea. With Bremerhaven right on the mouth the two comprise the state of Bremen (official name: Freie Hansestadt Bremen - Free Hanseatic City of Bremen).

The marshes and moraines near Bremen have been settled since about 12000 BC. Burial places and settlements in Bremen-Mahndorf and Bremen-Osterholz date back to the 7th century AD. In 150 AD the geographer Ptolemy refers to Fabiranum or Phabiranum, known today as Bremen. At that time the Chauci lived in the area now called north-western Germany or Lower Saxony. By the end of the 3rd century, they had merged with the Saxons. During the Saxon Wars (772–804) the Saxons, led by Widukind, fought against the West Germanic Franks, the founders of the Carolingian Empire, and lost the war.

A city is a relatively large and permanent settlement. Although there is no agreement on how a city is distinguished from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law.

For example, in the U.S. state of Massachusetts an article of incorporation approved by the local state legislature distinguishes a city government from a town. In the United Kingdom and parts of the Commonwealth of Nations, a city is traditionally a settlement with a royal charter. Historically, in Europe, a city was understood to be an urban settlement with a cathedral.

Cities generally have complex systems for sanitation, utilities, land usage, housing, and transportation. The concentration of development greatly facilitates interaction between people and businesses, benefiting both parties in the process. A big city or metropolis usually has associated suburbs and exurbs. Such cities are usually associated with metropolitan areas and urban areas, creating numerous business commuters traveling to urban centers for employment. Once a city expands far enough to reach another city, this region can be deemed a conurbation or megalopolis.