Hermione Granger’s Patronus in J.K. Rowling’s Harry Potter series is an otter.
A Patronus is a magical guardian produced by a defensive charm. Hermione’s takes the form of an otter, an animal associated with playfulness, intelligence, and curiosity. The otter is also one of Rowling’s favorite animals, which helps explain the personal significance of the choice.
Harry Potter’s Patronus is a stag, while Ron Weasley’s is a Jack Russell terrier. Severus Snape’s Patronus is a doe, matching Lily Potter’s Patronus and symbolizing his enduring love for her. Those forms are often confused because Patronuses are recurring visual symbols in the series.
Hermione first successfully produces a corporeal Patronus during her third year at Hogwarts. Her magical skill is a recurring part of her character, especially because she combines academic knowledge with courage and practical judgment.