Between the 12th century and modern times, the Swiss city of Basel has been home to three Jewish communities. The medieval community thrived at first but ended violently with the Basel massacre of 1349. As with many of the violent anti-Judaic events of the time, it was linked to the outbreak of the Black Death. At the end of the 14th century, a second community formed. But it was short-lived and disbanded before the turn of the century. For the following 400 years, there was no Jewish community in Basel. Today, there are several communities, ranging from liberal to religious to orthodox, and there are still more Jews who dont belong to any community.

Basel ( BAH-zəl, German: [ˈbaːzl̩] (listen)) or Basle ( BAHL; French: Bâle [bɑl]; Italian: Basilea [baziˈlɛːa]; Romansh: Basilea [baziˈleːɐ] (listen)) is a city in northwestern Switzerland on the river Rhine, located on the borders with France and Germany. Basel is Switzerland's third-most-populous city (after Zürich and Geneva) with about 175,000 inhabitants. The official language of Basel is (the Swiss variety of Standard) German, but the main spoken language is the local Basel German dialect.

Basel is famous for its many museums, including the Kunstmuseum, which is the first collection of art accessible to the public in the world (1661) and the largest museum of art in Switzerland, the Fondation Beyeler (located in Riehen), the Museum Tinguely and the Museum of Contemporary Art, which is the first public museum of contemporary art in Europe. Forty museums are spread throughout the city-canton, making Basel one of the largest cultural centres in relation to its size and population in Europe.

The University of Basel, Switzerland's oldest university (founded in 1460), and the city's centuries-long commitment to humanism, have made Basel a safe haven at times of political unrest in other parts of Europe for such notable people as Erasmus of Rotterdam, the Holbein family, Friedrich Nietzsche, Carl Jung, and in the 20th century also Hermann Hesse and Karl Jaspers.

Basel was the seat of a Prince-Bishopric starting in the 11th century, and joined the Swiss Confederacy in 1501. The city has been a commercial hub and an important cultural centre since the Renaissance, and has emerged as a centre for the chemical and pharmaceutical industries in the 20th century. In 1897, Basel was chosen by Theodor Herzl as the location for the first World Zionist Congress, and altogether the congress has been held there ten times over a time span of 50 years, more than in any other location. The city is also home to the world headquarters of the Bank for International Settlements. The name of the city is internationally known through institutions like the Basel Accords, Art Basel and FC Basel.

In 2019 Basel was ranked the tenth most liveable city in the world by Mercer.