Hispania was the Roman name for the Iberian Peninsula and its provinces. Under the Roman 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 Hispania 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 (CE 284) onwards, the south of the remainder of Tarraconensis was again split off as Carthaginensis, and all of the mainland Hispanic provinces, along with the Balearic Islands and the North African province of Mauretania Tingitana, were later grouped into a civil diocese headed by a vicarius. The name Hispania was also used in the period of Visigothic rule. The modern place names Spain and Hispaniola are both derived from Hispania.

The Romans improved existing cities, such as Tarragona (Tarraco), and established others like Zaragoza (Caesaraugusta), Mérida (Augusta Emerita), Valencia (Valentia), León ("Legio Septima"), Badajoz ("Pax Augusta"), and Palencia. The peninsula's economy expanded under Roman tutelage. Hispania supplied Rome with food, olive oil, wine and metal. The emperors Trajan, Hadrian, and Theodosius I, the philosopher Seneca, and the poets Martial, Quintilian, and Lucan were born in Hispania. Hispanic bishops held the Council of Elvira around 306.

After the fall of the Western Roman Empire in the 5th century, parts of Hispania came under the control of the Germanic tribes of Vandals, Suebi, and Visigoths.