McDonald's introduced the global advertising slogan “I'm lovin' it” in 2003.
The campaign launched internationally in September 2003 and became the first McDonald's advertising campaign developed for use around the world. Its wording used informal, upbeat language and was paired with a distinctive musical identity. The slogan was written with a lowercase style in many presentations, reinforcing its conversational tone.
The campaign followed earlier McDonald's lines such as “You Deserve a Break Today” and “Have You Had Your Break Today?” Those earlier slogans emphasized rest or a break, while “I'm lovin' it” focused on a personal reaction to the food and experience. The newer line was designed to work across languages and markets.
The campaign is frequently associated with the 2003 song and its later Justin Timberlake recording. The slogan itself belongs to McDonald's branding, while the music and performer are related campaign elements rather than alternate names for the slogan.