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Maria of Aragon ( c. 1299–1347 in Sijena) was a daughter of James II of Aragon and his second wife Blanche of Anjou.

She married Peter of Castile, Lord of Cameros (1290–1319), son of Sancho IV of Castile. Their daughter, Blanche of Castile (1319–1375), was betrothed to Peter I of Portugal but the marriage never took place. Maria died at Sijena in 1347.

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