Arias Pérez or Peres (fl. 1110–1129) was a Galician knight and military leader in the Kingdom of León. According to modern scholar Richard Fletcher, he was "active, resourceful, spirited and persuasive", and the contemporary Historia compostellana says that he was "so eloquent that he could turn black into white and white into black", although he "was not of the great nobility" (non fuit tamen magnae nobilitatis).