The County of Boulogne is a county within the kingdom of France during the 9th to 15th centuries, centered on the city of Boulogne-sur-Mer.

It is ruled by the counts of Flanders in the 10th century, but a separate House of Boulogne emerges in the 11th.

It is annexed by Philip II of France in 1212 and after this is treated as part of the county of Artois, until it is finally annexed into the royal domain in 1501.