Mühlhausen is a city in the north-west of Thuringia, Germany, 5 km north of Niederdorla, the country's geographical centre, 50 km north-west of Erfurt, 65 km east of Kassel and 50 km south-east of Göttingen.
Mühlhausen was first mentioned in 967 and became one of the most important cities in central Germany in the late Middle Ages. In the mid-13th century, it became a Freie Reichsstadt, an independent and republican self-ruled member of the Holy Roman Empire, controlling an area of approximately 220 square kilometres and 19 regional villages. Due to its long-distance trade, Mühlhausen was prosperous and influential with a population of 10,000 around 1500. Because it was spared from later destruction, Mühlhausen today has a great variety of historical buildings with one of the largest medieval city centres remaining in Germany, covering a surface of more than 50 hectares within the inner city wall and approximately 200 hectares overall. There are eleven Gothic churches, several patricians’ houses and a nearly completely preserved fortification.
Johann Sebastian Bach worked as the city's organist in 1707–08.