The Lancia Ypsilon is a supermini (B-segment) manufactured and marketed by Lancia, currently in its fourth generation and as of 2024, the marque's only model. The Ypsilon was released in 1995, as a larger and more expensive replacement to the Y10. Between 1995 and 2005, Lancia produced more than 870,000 Ypsilons in the Melfi plant in the Potenza region.

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.