Which McDonald's slogan debuted in 2003 and became globally famous?

McDonald's “I'm Lovin' It” slogan debuted in 2003 and became globally famous.

The campaign was launched internationally as a major unifying brand platform. Its wording used a casual first-person expression rather than a direct command, making it adaptable to food, music, youth culture, and everyday enjoyment. The campaign's short form also translated and localized relatively easily across markets.

The slogan is often connected with a jingle performed by Justin Timberlake, while the campaign's music and advertising were developed through a broader creative process involving agencies and musicians. The phrase became one of McDonald's longest-running global brand lines.

It followed earlier slogans such as “You Deserve a Break Today,” which had been prominent in the 1970s. “I'm Lovin' It” should not be confused with the company name or the Golden Arches logo: it is a verbal advertising platform, designed to work alongside those visual brand assets.