McDonaldland was the name of McDonald's fictional advertising world populated by colorful food-themed characters.
The setting gave McDonald's mascots a shared narrative environment rather than presenting them as unrelated figures. Ronald McDonald, Grimace, Mayor McCheese, Officer Big Mac, and other characters appeared in commercials and promotional material connected with this imaginary world.
McDonaldland is sometimes confused with a single character or with a restaurant play area. It was actually a branded fictional setting used in advertising. Its name also helped McDonald's organize a large group of mascots around a consistent visual and storytelling concept.
The world became especially prominent in the 1970s and was aimed heavily at children and families. Although McDonald's later moved toward more straightforward product and lifestyle advertising, McDonaldland remains an important chapter in the company's branding history.