The Battle of Cádiz (1640) was a naval battle in the Franco-Spanish War (1635-1659), which took place on July 21, 1640, when a French squadron under Jean Armand de Maillé-Brézé attacked a Spanish convoy coming from the Americas.

The attack occurred just in front of the coast of Cádiz. Armand de Breze employed a hitherto unknown tactic to attack the Spanish convoy from both sides. The Spanish lost a galleon and a small vessel but the convoy completed its journey and delivered most of its cargoes including its silver bullion. French losses are unknown.

• Duro, Fernandez Cesáreo (1898), Armada española desde la Unión de los Reinos de Castilla y de León (in Spanish), vol. 4, Madrid: Est. tipográfico "Sucesores de Rivadeneyra", pp. 263, 265

• Battle of Cadiz, [The Probert encyclopaedia of Warfare], archived from the original on April 2, 2012, retrieved April 17, 2012

36°29′39″N 6°13′1″W / 36.49417°N 6.21694°W / 36.49417; -6.21694