The Audi A1 is a supermini car launched by Audi at the 2010 Geneva Motor Show. Sales of the initial three-door A1 model started in Germany in August 2010, with the United Kingdom following in November 2010. A five-door version, called Sportback, was launched in November 2011, with sales starting in export markets during spring 2012. The second generation was released in 2019. The three-door production model was discontinued.

The B-segment is the second smallest of the European segments for passenger cars, between the A-segment and C-segment, and commonly described as "small cars". The B-segment is the largest segment in Europe by volume, accounting for 20 percent of total car sales in 2020 according to JATO Dynamics.