McDonald’s adopted a red-and-yellow logo scheme in 2003 for its “i’m lovin’ it” campaign.
The campaign marked a major branding shift toward a simple, globally consistent platform. McDonald’s retained its recognizable Golden Arches while presenting the logo in a red-and-yellow treatment associated with the company’s established visual identity.
The phrase was introduced internationally in 2003 and became one of McDonald’s longest-running global marketing platforms. The lowercase styling of “i’m lovin’ it” was also used as part of the campaign’s recognizable presentation.
This question concerns the campaign-era color treatment, not the original architectural arches or every logo variation McDonald’s has used. Restaurants, packaging, and regional materials have sometimes used additional colors, but red and yellow were the defining pair in the standard campaign branding.