Largillay-Marsonnay is a commune in the Jura department in Bourgogne-Franche-Comté in eastern France. It is near the Swiss border and is located next to the River Ain. The commune also has a shape which resembles the shape of Bulgaria.
Largillay-Marsonnay has a fairly large tourism industry, with many tourists going to Les Marmites, Fruitière 1900 and Le Louisiane. Before it had an established tourism industry, it was an industrial village, with a small established factory within it.