Wallia or Valia (in Spanish: Walia, in Portuguese Vália), (c. 385 – 419) was king of the Visigoths from 415 to 419, earning a reputation as a great warrior and prudent ruler. He was elected to the throne after Athaulf and then Sigeric were assassinated in 415.
Early on, Wallia made peace with Emperor Honorius and accepted a treaty with the Roman Empire. He also returned Honorius' sister Galla Placidia to him. As gains from these arrangements, Wallia was granted Aquitaine in 417 as a region where the Visigoths would be based as official allies or foederati. He established his court in Toulouse, which became the Visigothic capital for the rest of the fifth century.
In 418 he honored the alliance by invading Hispania, where his army destroyed the Siling Vandals and so reduced the numbers of Alans living there that the survivors placed themselves under the rule of Gunderic, king of the Asding Vandals.
Some historical sources say that he was related to Alaric only by marriage. He was succeeded by Alaric's illegitimate son or son in law Theodoric. Wallia's daughter married Rechila, King of the Suevi, and was the mother of Ricimer and the mother in law of Gundowech, King of the Burgundians.