Which slogan did McDonald's launch in 2003 and continue using internationally?

McDonald's launched the slogan “I'm Lovin' It” in 2003.

The phrase became one of the chain's most recognizable global marketing lines and was paired with a short musical hook. McDonald's introduced it as part of a major worldwide branding campaign, making it easier for customers in different markets to recognize the same central identity.

The campaign is often associated with a song recorded by Justin Timberlake, although the slogan itself became the enduring corporate phrase. The melody and wording were adapted for advertising in multiple languages and markets.

People sometimes confuse this slogan with McDonald's earlier campaigns, especially “You Deserve a Break Today,” which dates from the 1970s. “I'm Lovin' It” is the later phrase and remains particularly associated with the company's modern global branding.