Eilika Duchess of Oldenburg (née Eilika Helene Jutta Clementine Duchess of Oldenburg; born 22 August 1972) is the wife of Georg von Habsburg, the third in the line of succession to the former Austro-Hungarian throne. She is a daughter of Johann Duke of Oldenburg and his wife Ilka Countess of Ortenburg. Her father is a younger son of Nikolaus, Hereditary Grand Duke of Oldenburg and his wife Princess Helena of Waldeck and Pyrmont, while her mother is the third child of Count Alfred of Ortenburg and Jutta von Lücken.