The Marvelous Land of Oz: Being an Account of the Further Adventures of the Scarecrow and the Tin Woodman, commonly shortened to The Land of Oz, published 1904, is the second of L. Frank Baum's books set in the Land of Oz, and the sequel to The Wonderful Wizard of Oz. This and the next thirty-four Oz books of the famous forty were illustrated by John R. Neill. The book was made into an episode of The Shirley Temple Show in 1960 and into a Canadian animated feature film of the same name in 1987. It was also adapted in comic book form by Marvel Comics, with the first issue being released in November 2009. Plot elements from The Marvelous Land of Oz are included in the 1985 Disney feature film Return to Oz.

The Oz books form a book series that relates the fictional history of the Land of Oz. L. Frank Baum went on to write fourteen full-length Oz books. Even while he was alive, Baum was styled as "the Royal Historian of Oz" to emphasize the concept that Oz is an actual place. The illusion created was that characters such as Dorothy and Princess Ozma related their adventures in Oz to Baum themselves, by means of wireless telegraph.

Lyman "L." Frank Baum (1856-1919) was an American author of children's books, best known for writing The Wonderful Wizard of Oz. He wrote thirteen novel sequels, nine other fantasy novels, and a host of other works (55 novels in total, plus four "lost" novels, 83 short stories, over 200 poems, an unknown number of scripts, and many miscellaneous writings). His works anticipated such century-later commonplaces as television, augmented reality, laptop computers (The Master Key), wireless telephones (Tik-Tok of Oz), women in high risk, action-heavy occupations (Mary Louise in the Country), and the ubiquity of advertising on clothing (Aunt Jane's Nieces at Work).

Baum's avowed intentions with the Oz books, and other fairy tales, was to tell such tales as the Brothers Grimm and Hans Christian Andersen told, making them American and bringing them up to date by making the characters not stereotypical dwarfs or genies, and by removing both the violence and the moral to which the violence was to point. Although the first books contained a fair amount of violence, it decreased with the series; in The Emerald City of Oz, Ozma objected to doing violence even to the Nomes who threaten Oz with invasion. His introduction is often cited as the beginnings of the sanitization of children's stories, although he did not do a great deal more than eliminate harsh moral lessons. His stories still include decapitations, eye removals, maimings of all kinds, and other violent acts, but the tone is very different from Grimm or Andersen.