List of dukes in the peerage of Spain

This is a list of the 149 present and extant royal and non-royal dukes in the peerage of the Kingdom of Spain. The oldest six titles – created between 1380 and 1476 – were Duke of Medina Sidonia (1380), Duke of Alburquerque (1464), Duke of Segorbe (1469), Duke of Alba (1472), Duke of Escalona (1472), and Duke of Infantado (1475).