Mac Tonight was McDonald's 1980s advertising character associated with a moon-shaped head and the song “Mac Tonight.”
McDonald's introduced the campaign in 1986 to promote evening dining. The character wore sunglasses and sang a rewritten version of the popular song “Mack the Knife,” using the phrase “Mac Tonight” to make the restaurant's nighttime availability memorable.
The moon-faced design gave the campaign a distinctive visual identity that differed from McDonaldland's usual cast of cartoon characters. Television commercials, in-store materials, and promotional appearances used the character to associate McDonald's with dinner and late-evening visits.
Mac Tonight is sometimes mistaken for a permanent mascot or a variation of Ronald McDonald. It was instead a specific advertising character and campaign. Its strongest association is with the 1986 nighttime promotion and the recognizable musical hook built around the name.