Guillon, Yonne

Guillon is a former commune in the Yonne department in Bourgogne-Franche-Comté in north-central France. On 1 January 2019, it was merged into the new commune Guillon-Terre-Plaine. It is located near the Côte-d'Or and the Nièvre department.

Guillon once had a castle and a peripheral wall. The location of the castle, demolished in 1418, is no longer known.

During the Hundred Years' War, Guillon was occupied by the English army until a treaty was signed in 1360 between Burgundy and England known as the Treaty of Guillon or the Treaty of Golden Sheep. Under this three-year agreement, the Burgundians paid 200,000 gold pieces to the English.