 Dukedoms of Portugal
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 Marquisates of Portugal
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 Countships of Portugal
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 Viscountcies of Portugal
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 Baronies of Portugal
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The highest hereditary title in the Portuguese nobility. By tradition, there are a total of five royal and seven non-royal dukes in Portugal, out of 28 dukedoms that have ever been created. In the majority of cases, the title of duke was attributed to members of the high nobility, usually relatives of the Portuguese royal family, such as the second son of a monarch.
There are exceptions, like António José de Ávila, who, although not having any relation to the royal family, was given the title of duke of Ávila and Bolama.