Adele or Adelaide of Aquitaine (or Adelaide of Poitiers) (c. 945 or 952–1004) was the daughter of William III of Aquitaine and Adele of Normandy.

Her father used her as security for a truce with Hugh Capet, whom she married in 970. In 987, after the death of Louis V, the last Carolingian king of France, Hugh was elected the new king with Adelaide as queen. They were proclaimed at Noyon and blessed at Reims. They were the founders of the Capetian dynasty of France.

Their children were:

• Hedwige (or Hadevide, or Avoise) (c. 969–after 1013), wife of Rainier IV of Hainaut
• the future king Robert II (972–1031), crowned co-king 987 to order to consolidate the new dynasty
• Gisele (974–1002), wife of Hugh I of Ponthieu
• Adelaide, (990–1063), wife of Renaud I of Nevers