Mac Tonight was a McDonald's advertising character known for wearing a moon-shaped mask in the 1980s. The character promoted McDonald's evening business and was built around a memorable lounge-singer performance style.
Mac Tonight appeared in a campaign that used a rewritten version of “Mack the Knife” to advertise nighttime visits. The crescent-moon head and dark sunglasses made the character visually distinct from Ronald McDonald and the older McDonaldland cast. The campaign helped communicate that McDonald's was a place to visit after dark, not only during daytime meals.
Mac Tonight is sometimes incorrectly grouped with the original McDonaldland characters. He was a later advertising creation with a separate musical and nighttime identity. The character also became associated with legal disputes over the song's use, contributing to the campaign's eventual disappearance from prominent McDonald's advertising.