The Tin Woodman, sometimes referred to as the Tin Man or the Tin Woodsman, (the third name appears only in adaptations, the first—and in rare instances, the second—was used by Baum), is a character in the fictional Land of Oz created by American author L. Frank Baum. Baum's Tin Woodman first appeared in his classic 1900 book, The Wonderful Wizard of Oz, and reappeared in many other Oz books. 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 reportedly inspired to invent the Tin Woodman by a figure he had built out of metal parts for a shop display.

In the books, the origins of the character are rather gruesome. Originally an ordinary man by the name of Nick Chopper (the name first appearing in The Marvelous Land of Oz), the Tin Woodman used to make his living chopping down trees in the forests of Oz, as his father had before him. The Wicked Witch of the East enchanted his axe to prevent him from marrying the girl that he loved, after being bribed by the old woman who kept the girl as a servant, and did not wish to lose her. (In a later book of the series, The Tin Woodman of Oz, the girl is said to be the Witch's servant, and it is the Witch herself who decides to enchant Nick's axe.) The enchanted axe chopped off his limbs, one by one. Each time he lost a limb, Nick Chopper replaced it with a prosthetic limb made of tin. Finally, nothing was left of him but tin. However, Ku-Klip, the tinsmith who helped him, neglected to replace his heart. Once Nick Chopper was made entirely of tin, he was no longer able to love the girl he had fallen for.