Category:Duchesses of Oldenburg

The title Duchess of Oldenburg and the use of the style "Highness" or "Royal Highness" has generally been restricted to the following persons:
 * the spouse of the ruler of the Duchy of Oldenburg (only one ever existed)
 * the spouse of the deposed head of the Grand Ducal House of Oldenburg
 * the legitimate male-line female descendants of a head of the Grand Ducal House of Oldenburg
 * the spouses of legitimate male-line descendants of a head of the Grand Ducal House of Oldenburg