McDonald's first used the “I'm Lovin' It” slogan in an advertising campaign in 2003.
The campaign launched internationally in 2003 and marked a major effort to give McDonald’s a consistent global marketing platform. Its phrase was short, conversational, and designed to connect the brand with enjoyment rather than simply describing a product or price.
The campaign also used music and a distinctive five-note audio signature. The English-language phrase became one of the company’s most recognizable modern brand elements and continued in McDonald’s advertising for many years.
People sometimes associate the slogan with the song performed by Justin Timberlake, but the slogan and the broader campaign involved advertising agencies, music creators, and international adaptations. The key branding date is 2003, not the release date of any one recording.