Tettnang is a town in the Bodensee district in southern Baden-Württemberg in Swabia region of Germany.

It lies 7 kilometres from Lake Constance. The region produces significant quantities of Tettnang hop, an ingredient of beer, and ships them to breweries throughout the world.

Tettinang or Tettinac was first mentioned in 882 in a document of the Abbey of St. Gall. In the beginning of the 10th century the castle of the Counts of Montfort was built near the town. The town privileges were granted in 1294 by King Adolf of Nassau. The reign of the Counts of Montfort ended 1780 when they sold the county to Austria, along with Tettnang Castle to pay debts. The county became part of Further Austria under the house of Habsburg. In the Peace of Pressburg of 1805 it became Bavarian property which gave it to Württemberg five years later. With the merge of Baden, Hohenzollern and Württemberg in 1952 it became part of the new formed state Baden-Württemberg. Until 1973 it was capital of the district Tettnang which was merged with parts of district of Überlingen to form the Bodenseekreis.

Year	1450	1848	1960	1990	2000	2005	2006	2007	2009	2010	2015	2020	2021	2022	2023
Inhabitants	~ 650	~ 1,400	7,115	16,251	17,432	18,323	18,213	18,467	18,571	18,806	18,975	19,996	20,134	20,452	20,682

The second release of the Linux operating system Fedora was named "Tettnang" because of the hops grown in Tettnang being used for making beer. The release was preceded by the beer-related name "Yarrow" (an early substitute for hops) and followed by "Heidelberg" (a German city and the name of a distributor of beer).

The anti-virus software vendor Avira, a company with around 100 million customers and 500 employees all over the world, has its headquarters in Tettnang. Based near Lake Constance, the security specialist is one of the biggest regional entrepreneurs.

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  Altar of Saint George's church, Tettnang
• 
  The new castle
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  Gate Castle
• 
  Gate Castle with Coats of arms

• Antje von Dewitz (born 1972), business woman
• Juliane Banse (born 1969), soprano
• Winfried Brugger (1950-2010), legal scientist
• Marco Mathis (born 1994), cyclist
• Sascha Rösler (born 1977), footballer
• Thiemo Storz (born 1991), racing car driver
• Gregor Traber (born 1992), athlete
• Giulia Gwinn (born 1999), fußballerin

• Eduard Adorno (1920-2000), landowner and politician (CDU)
• Ivan Shekov (born 1942), composer and concert pianist
• Thom Barth (born 1951), painter, graphic artist and installation artist

• Official City Homepage
• Tettnang Hop Growers, Germany