Which McDonald's slogan asked customers, “Where's the beef?” in a famous 1980s campaign?

“Where's the beef?” was a Wendy's slogan, not a McDonald's slogan.

Wendy's used the phrase in a 1984 advertising campaign featuring Clara Peller questioning the amount of beef in a competitor's hamburger. The line became a widely repeated catchphrase and is often remembered independently of the commercial that popularized it.

Because McDonald's, Wendy's, and Burger King all competed heavily through hamburger advertising, the slogan is sometimes incorrectly assigned to McDonald's. McDonald's had its own long-running lines and characters, including “You Deserve a Break Today” and the McDonaldland cast.

The question tests brand attribution rather than a McDonald's campaign. Wendy's is the single correct source of the slogan, while McDonald's was one of the major fast-food rivals operating in the same advertising market.