Agnes of Aquitaine (end of 1072 – 6 June 1097) was a queen consort of Navarre. She was a daughter of William VIII, Duke of Aquitaine, and his third wife, Hildegarde of Burgundy.
In 1081, Agnes was betrothed to Peter I of Aragon and Navarre. In 1086, the couple married in Jaca; upon Peter's succession, Agnes became queen of Aragon and Navarre. By him, Agnes had two children, both of whom predeceased their father: Peter (died 1103) and Isabella (died 1104).
Agnes died in 1097, and her husband remarried to a woman named Bertha.