Nick Chopper, the Tin Woodman, is a character in the fictional Land of Oz created by American author L. Frank Baum. He first appeared in his 1900 book The Wonderful Wizard of Oz and reappeared in many other subsequent Oz books in the series. In late 19th-century America, men made out of various tin pieces were used in advertising and political cartoons. Baum, who was editing a magazine on decorating shop windows when he wrote The Wonderful Wizard of Oz, was inspired to invent the Tin Woodman by a figure he had built out of metal parts for a shop display.

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 in July 1904, is the second book in L. Frank Baum's Oz series, and the sequel to The Wonderful Wizard of Oz (1900). This and the following 34 books in the series were illustrated by John R. Neill.