The Second Battle of Boulou took place during the War of the Pyrenees, part of the French Revolutionary Wars. This battle saw the French Army of the Eastern Pyrenees led by General of Division (GD) Jacques François Dugommier attack the joint Spanish-Portuguese Army of Catalonia under Lieutenant General (LG) Luis Fermín de Carvajal, Conde de la Unión. Dugommier's decisive victory resulted in the French regaining nearly all the land they lost to the Kingdom of Spain in 1793.

The War of the Pyrenees, also known as War of Roussillon or War of the Convention, was the Pyrenean front of the First Coalition's war against the First French Republic. It pitted Revolutionary France against the kingdoms of Spain and Portugal from March 1793 to July 1795 during the French Revolutionary Wars.