Alonso González de Nájera (died 1614) was a Spanish soldier and an advocate of reforms in the conduct of the War of Arauco. He served in the war following the Disaster of Curalaba and the great Mapuche uprising that followed in Chile that resulted in the loss of all the Spanish settlements south of the Bio Bio River. He was sent back to the royal court in Spain to argue for a reform to the way the war against the Mapuche was fought. Nájera's arguments for his reforms were incorporated in his book of ''Desengaño y reparo de la Guerra del Reino de Chile'' (Disappointment and Reparation of the War of the Kingdom of Chile).
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