- "Eels' Eyes can be used in all sorts of potions."
Eel eyes are eels' optical organs. They are used in Potion-making. They might be an ingredient for the Bulgeye Potion. The Apothecary in Diagon Alley sells jars of eels' eyes for one Galleon each.
According to a painting at St Mungo's, one must stand naked in a barrel of eel's eyes at the full moon with a frog's liver tied tightly about one's throat to cure Spattergroit; the legitimacy of this claim remains somewhat unconfirmed.
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Order of the Phoenix (Mentioned only)
- Harry Potter Trading Card Game