Nuño Álvarez de Carazo (floruit 1028–1054) was a Castilian nobleman, diplomat, and warrior.
The lowlands near where the river Arlanza entered the Arlanzón were probably part of his lordship, and Nuño possessed properties in Peñalba and Vilviestre del Pinar halfway between Carazo and Navarre.
[5] Nuño also had properties in La Bureba, including at Ibeas de Juarros and perhaps at Oca.
Sometime later, probably between 1030 and 1035,[7] Nuño Álvarez and his neighbour across the border in Navarre, Fortún Ochoiz, re-confirmed the division and the frontier.
It is also possible that Nuño and Fortún confirmed the old frontier in an act of rebellion, without authority from their respective lords.