The Numantine War (from Bellum Numantinum in Appian's Roman History) was the last conflict of the Celtiberian Wars fought by the Romans to subdue those people along the Ebro, in what is now Spain. It was a twenty-year conflict between the Celtiberian tribes of Hispania Citerior and the Roman government. It began in 154 BC as a revolt of the Celtiberians of Numantia on the Douro. The first phase of the war ended in 151, but in 143, war flared up again with a new insurrection in Numantia.
The first war was fought contemporaneously with the Lusitanian War in Hispania Ulterior. The Lusitanians were subdued by Sulpicius Galba, who betrayed their surrender and executed their leading men, and the Arevaci of Hispania Citerior continued the war and allied with the Lusitanian leader Viriathus.