The Sphinx is a magical beast with the body of a large lion and the head of a human woman. It is an ancient creature famed for its intelligence, its capacity for human speech, and its love of riddles and puzzles. Sphinxes are often employed by wizards and witches as guardians for valuable treasures or hidden locations. A Sphinx was notably used as one of the magical obstacles protecting the Triwizard Cup in the final task of the 1994 Triwizard Tournament.
The only direct encounter with a Sphinx in the series occurs in Harry Potter and the Goblet of Fire.
A Sphinx has the body of a very large, tawny lion and the head of a woman. The one Harry encountered had large, almond-shaped eyes and long-fingered hands. They are capable of articulate human speech and possess near-human intelligence. This high intelligence has led to centuries of debate over whether they should be reclassified as Beings rather than Beasts. However, their inherent love for puzzles and riddles can turn violent when they are not satisfied, which is why the Ministry of Magic continues to classify them as Beasts (Fantastic Beasts and Where to Find Them). The Sphinx in the Triwizard Maze behaved in a formal and fair manner, honouring her agreement once her riddle was solved.
The name and concept of the Sphinx are taken directly from Greek mythology. The Sphinx of Thebes was a legendary creature with the head of a woman, the body of a lion, and often the wings of a bird. She guarded the entrance to the city of Thebes and would pose a riddle to travellers. Those who could not answer correctly were killed and devoured, a fate that befell many until Oedipus finally solved her riddle.