Which advertising agency created McDonaldland for McDonald's in 1970?

Needham, Harper & Steers created McDonaldland for McDonald's in 1970.

The agency developed a fantasy world populated by branded characters, including Mayor McCheese, Grimace, the Hamburglar, and Officer Big Mac. McDonaldland gave McDonald's a distinctive advertising setting aimed especially at children, linking menu items and restaurant visits to a recurring fictional universe.

McDonaldland is sometimes confused with Ronald McDonald himself. Ronald was the chain's central mascot, while McDonaldland was the larger setting in which Ronald and other characters appeared. The campaign became one of the most recognizable examples of character-based fast-food branding.

McDonald's later faced legal disputes over similarities between McDonaldland characters and characters from the children's program H.R. Pufnstuf. The controversy helped shape the campaign's history, but it does not change the agency credited with creating McDonaldland.