Illustrious Highness is the English-language form for a style used by various members of the European aristocracy. It is used to translate the German word Erlaucht, a style used by the cadet members of some mediatized princely families, as well as the members of some mediatized comital families. It is sometimes used to translate the Russian word Ssiatelstvo, a style used by members of some Russian princely families (also sometimes translated as Serene Highness).

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v • d • e Styles used by monarchs and royalty Reigning monarchs His Holiness (HH) • Apostolic Majesty (HAM) • Imperial and Royal Majesty (HI&RM) • Imperial Majesty (HIM) • Royal Majesty (HRM) • Majesty (HM) • Catholic Majesty (HCM) • Most Christian Majesty (HMCM) • Most Faithful Majesty (HFM) • Britannic Majesty (HBM)• Royal Highness (HRH) • Exalted Highness (HEH) • Highness (HH) • Serene Highness (HSH) Imperial Crown of Austria Members of sovereign and noble families Imperial and Royal Highness (HI&RH) • Imperial Highness (HIH) • Royal Highness (HRH) • Grand Ducal Highness (HGDH) • Highness (HH) • Ducal Serene Highness (HDSH) • Serene Highness (HSH) • Illustrious Highness (HIll.H)