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Alfonso Félix de Ávalos Aquino y Gonzaga, 8th Marquis of Pescara, 4th Marquis of Vasto (Ischia 1564 – Rome, 2 December 1593), was an Italian noble in the service of the King of Spain.

Alfonso Félix was the eldest son of Francesco Ferdinando d'Ávalos, governor of Milan and viceroy of Sicily, and Isabella Gonzaga.

He commanded cavalry for Spain against the Dutch Revolt, where he gained a victory in the Battle of Zutphen in 1586.
He was a Grandee of Spain and became also a Knight in the Order of the Golden Fleece.

In 1583 he married Lavinia della Rovere (1558–1632), daughter of Guidobaldo II della Rovere, Duke of Urbino and Vittoria Farnese, granddaughter of Pope Paul III.
They had 3 daughters. His eldest daughter, Isabella d’Avalos d’Aquino d’Aragona (1585–1648), married her father's cousin Inigo d’Avalos d’Aquino d’Aragona (1578–1632) and had issue.

• Gran Enciclopedia de España. Band 3, 1991, S. 1,109 f. ISBN 84-87544-01-0
• Genealogisches Handbuch der fürstlichen Häuser. Band XV, S. 540 f., C. A. Starke Verlag, 1997, ISBN 3-7980-0814-0

• Geneall
• Our Royal, Titled, Noble, and Commoner Ancestors & Cousins
• Lavinia Feltria della Rovere e Felice Alfonso d'Avalos, un matrimonio stroncato