Rododafni castle (Greek: Καστέλλο της Ροδοδάφνης) is a palace in Penteli, Greece.
It is located on the Lord Byron street (Greek: οδού Λόρδου Βύρωνος) on the slope of mount Pentelicus.
It was intended as a summer residence for Sophie de Marbois-Lebrun, Duchess of Plaisance and is designed in a neo-gothical style, which was uncommon in 19th century Greece.
Due to her vast financial resources, she was able to purchase large tracts of land in Athens and surrounding Attica, primarily in Penteli, on which she erected not less than six palaces and houses.
There is a local legend that she had left the Penteli buildings half-finished without roofs and windows due to the superstitious fear that she would die when one of them was finished according to the French writer Edmon About, who was befriended with the Duchess.