The Bay of Gibraltar, also known as Bay of Algeciras, is a bay at the southern end of the Iberian Peninsula. It is around 10 km long by 8 km wide, covering an area of some 75 km2, with a depth of up to 400 m in the centre of the bay. It opens to the south into the Strait of Gibraltar and the Mediterranean Sea.

The shoreline is densely settled. From west to east, the shore is divided between the