The Celtiberians are Celtic-speaking people of the Iberian Peninsula in the final centuries BCE.

The group originated when Celts migrated from Gaul and integrated with the local pre-Indo-European populations, in particular the Iberians.

Archaeologically, the Celtiberians participated in the Hallstatt culture in what is now north-central Spain.

The term Celtiberi appears in accounts by Diodorus Siculus, Appian and Martial who recognized a mixed Celtic and Iberian people; Strabo saw the Celts as the more dominant group in this blend.

Extant tribal names include the Arevaci, Belli, Titti, and Lusones.The Celtiberian language is attested from the 1st century BCE.

Other possibly Celtic languages, like Lusitanian, were spoken in pre-Roman Iberia.

The Lusitani gave their name to Lusitania, the Roman province name covering current Portugal and Extremadura.