Gibraltar (pronounced /dʒɨˈbrɔːltər/) is a self-governing British overseas territory located on the southern end of the Iberian Peninsula and Europe at the entrance of the Mediterranean overlooking the Strait of Gibraltar. The territory covers 6.843 square kilometres (2.642 sq mi) and shares a land border with Spain to the north. Gibraltar has historically been an important base for the British Armed Forces and is the site of a Royal Navy base.

The name Gibraltar is the Spanish derivation of the Arabic name Jabal Tāriq (جبل طارق), meaning "mountain of Tariq". It refers to the geological formation, the Rock of Gibraltar, which in turn was named after the Berber Umayyad general Tariq ibn-Ziyad who led the initial incursion into Iberia in advance of the main Moorish force in 711 under the command of Umayyad Caliph Al-Walid I. Earlier, it was known as Mons Calpe, one of the Pillars of Hercules. Today, Gibraltar is known colloquially as Gib or The Rock.