Pedro Alfonso or Alfónsez (Latin: Petrus Adefonsi; floruit 1126–1173) was an Asturian magnate, dominating the region from 1139 until his death. He had vast landholdings in the Asturias, the region of León, and "kingdom" of Toledo, including in the cities of León and Toledo themselves, the most important cities of the realm. His commercial dealings were extensive, a sign of his economic power, and he loyally served Alfonso VII and his son Ferdinand II as a military commander and diplomat from 1128 until his death.