Hispania was the Roman name for the Iberian Peninsula. Under the Republic, Hispania was divided into two provinces: Hispania Citerior and Hispania Ulterior. During the Principate, Hispania Ulterior was divided into two new provinces, Baetica and Lusitania, while Hispania Citerior was renamed Tarraconensis. Subsequently, the western part of Tarraconensis was split off, first as Hispania Nova, later renamed Callaecia (or Gallaecia, whence modern Galicia). From Diocletian's Tetrarchy (AD 284) onwards, the south of remaining Tarraconensis was again split off as Carthaginensis, and probably then too the Balearic Islands and all the resulting provinces formed one civil diocese under the vicarius for the Hispaniae (that is, the Celtic provinces). The name, Hispania, was also used in the period of Visigothic rule. The modern name Spain derives from Hispania.

The origin of the word Hispania is much disputed and the evidence for the various speculations are based merely upon what are at best mere resemblances, likely to be accidental, and suspect supporting evidence. One theory holds it to be of Punic derivation, from the Phoenician language of colonizing Carthage. Specifically, it may derive from a Punic cognate of Hebrew אי-שפניא (i-shfania) meaning "Island of the Hyrax" or "island of the hare" or "island of the rabbit" (Phoenician-Punic and Hebrew are both Canaanite languages and therefore closely related to each other). Another theory, proposed by the etymologist Eric Partridge in his work Origins, is that it is of Iberian derivation and that it is to be found in the pre-Roman name for Seville, Hispalis, which strongly hints at an ancient name for the country of *Hispa, an Iberian or Celtic root whose meaning is now lost. It may alternatively derive from Heliopolis (Greek for "city of the sun"). Occasionally it was called Hesperia, the western land, by Roman writers, or Hesperia ultima.