Mannheim, officially the University City of Mannheim, is the second-largest city in the German state of Baden-Württemberg (after Stuttgart) with a 2020 population of approximately 309,119 inhabitants. The city is at the centre of the Rhine-Neckar Metropolitan Region, Germany's eighth-largest metropolitan region.

Mannheim is located at the confluence of the Rhine and the Neckar in the northwestern corner of Baden-Württemberg. The Rhine separates Mannheim from the city of Ludwigshafen, just to the west of it in Rhineland-Palatinate, and the border of Baden-Württemberg with Hesse is just to the north. Mannheim is downstream along the Neckar from the city of Heidelberg.

Mannheim is unusual among German cities in that its streets and avenues are laid out in a grid pattern, leading to its nickname "die Quadratestadt" (the Square City). The eighteenth century Mannheim Palace, former home of the Prince-elector of the Palatinate, now houses the University of Mannheim.

The city is home to major corporations including Daimler, John Deere, Caterpillar, ABB, Fuchs Petrolub, IBM, Roche, Reckitt Benckiser, Unilever, Phoenix Group, Pepperl+Fuchs, Siemens, and several other well-known companies. In addition, Mannheim's SAP Arena is not only the home of the German ice hockey record champions the Adler Mannheim, but also the well-known handball team, the Rhein-Neckar Löwen. Since 2014, Mannheim has been a member of the UNESCO Creative Cities Network and holds the title of "UNESCO City of Music". Mannheim is a smart city; the city's electrical grid is installed with a power-line communication network.

The city's tourism slogan is "Leben. Im Quadrat." The civic symbol of Mannheim is der Wasserturm (the Watertower), a Romanesque water tower completed in 1886 that rises to 60 metres (200 feet) above the highest point of the art nouveau area Friedrichsplatz. Mannheim is the starting and finishing point of the Bertha Benz Memorial Route.

Main sights:

• Fernmeldeturm Mannheim
• Mannheim synagogue - Post World War II synagogue
• Yavuz Sultan Selim Mosque
• Luisenpark - named one of the loveliest parks in Europe
• Mannheim Palace (Mannheimer Schloss) - the city castle and main building of the University of Mannheim
• Wasserturm - the town's landmark water tower
• Jesuit Church
• SAP Arena - multifunctional indoor arena, home of Mannheim's ice-hockey team "Die Adler" ("The Eagles")
• Breite Strasse, Kunststrasse, and Kapuzinerplanken - Mannheim's main shopping destination
• International Filmfestival Mannheim-Heidelberg
• Kunsthalle Mannheim, museum of modern and contemporary art
• Multihalle - multi-purpose hall in Mannheim's Herzogenriedpark, the world's largest self-supporting wooden lattice-shell construction
• Wildpark and Waldvogelpark am Karlstern
• The city centre, designed in squares (Quadratestadt)
• Reißinsel, a natural area that an honorary citizen of Mannheim, Carl Reiß, bequeathed to the residents of Mannheim
• Reiß-Engelhorn-Museen, museum with four exhibition halls presenting exhibits in archaeology, world cultures, history of art and culture, photography, and history of theater and music
• Marktplatz (Market square) hosts a farmers' market every Tuesday, Thursday, and Saturday. Fresh fruit, vegetables, and flowers are sold
• Mannheimer Messe (the Mannheim-Fair): twice a year (spring & autumn) a big fair takes place on Neuer Messplatz-square.