A tall tale is a story with unbelievable elements, related as if it were true and factual. Some tall tales are exaggerations of actual events, for example fish stories ("the fish that got away") such as, "That fish was so big, why I tell ya', it nearly sank the boat when I pulled it in!" Other tall tales are completely fictional tales set in a familiar setting, such as the European countryside, the American frontier, the Canadian Northwest, the Australian outback, or the beginning of the Industrial Revolution.

Events are often told in a way that makes the narrator seem to have been a part of the story; the tone is generally good-natured. Legends are differentiated from tall tales primarily by age; many legends exaggerate the exploits of their heroes, but in tall tales the exaggeration looms large, to the extent of dominating the story.