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Magical creatures are an aspect of the fictional wizarding world contained in the Harry Potter and Fantastic Beasts and Where to Find Them series, both by British author J. K. Rowling. Throughout the seven books of the series, Harry and his friends come across many of these creatures on their adventures, as well as in their Care of Magical Creatures lessons at Hogwarts. The Care of Magical Creatures Class take care of creatures such as Hippogriffs, Unicorns and Owls. Rowling has also written Fantastic Beasts and Where to Find Them, a guide to the magical beasts found in the series. Many of these are derived from folklore, primarily Greek mythology, but also British and Scandinavian folklore. Many of the legends surrounding mythical creatures are also incorporated in the books. "Children ... know that I didn't invent unicorn, but I've had to explain frequently that I didn't actually invent hippogriff," Rowling told Stephen Fry in an interview for BBC Radio 4. "When I do use a creature that I know is a myth entity, I like to find out as much as I can about it. I might not use it, but to make it as consistent as I feel is good for my plot."

Some creatures in the series are ordinary animals but may be imbued with magical properties or possess certain magical abilities. Owl, for example, deliver mail and have the ability to find the recipient regardless of their location. Other animals such as cats, frogs and rats do not necessarily have magical abilities.

In the Harry Potter franchise, Magizoology (a portmanteau of "magic" and "zoology") is the study of magical creatures. A person who studies Magizoology is known as a magizoologist. There are magizoologists who work in the Ministry of Magic, particularly in the Department for the Regulation and Control of Magical Creatures. One notable magizoologist is Newt Scamander, who in the universe of the series, is the author of Fantastic Beasts and Where to Find Them and the main character in the Fantastic Beasts franchise, which serves as a prequel to the Harry Potter story.

The Department for the Regulation and Control of Magical Creatures of the Ministry of Magic is responsible for overseeing and regulating magical creatures. It is divided into three divisions: the Beast Division, the Being Division, and the Spirit Division.

Mountain Troll (Harry Potter) has not been a contender in any CBUB matches.