Wizardology: The Book of the Secrets of Merlin is a children's book created and published by in the UK, and published by Candlewick Press in America in 2005. The book is marketed as having been written by Merlin, and is the third book in the 'Ology series. Wizardology is filled with useful spells and magical information. There are numerous pockets, flaps, secret codes, and scavenger hunts hidden throughout the book. The publisher was Dugald Steer, while the book was designed by , and features the artwork of , Tomislav Tomic, John Howe, and Anne Yvonne Gilbert.