McDonaldland was McDonald's fictional advertising world featuring Mayor McCheese and the Hamburglar.
The campaign presented McDonald's characters as residents of an imaginary place built around the restaurant's food and branding. Ronald McDonald served as its best-known figure, while Mayor McCheese, the Hamburglar, Grimace, and other characters appeared in television commercials, packaging, playgrounds, and promotional materials.
McDonaldland was particularly prominent during the 1970s and 1980s, when fast-food companies increasingly used mascots and recurring characters to reach children. Its visual language turned menu items and restaurant features into parts of a shared fantasy setting.
The name is sometimes mixed up with “McWorld,” a later McDonald's advertising slogan and concept. McDonaldland specifically refers to the fictional character universe and its setting.