Mac Tonight was the name of McDonald's crescent-moon character in its 1980s advertising campaign.
The character was introduced in 1986 to promote McDonald's evening business. Mac Tonight had a crescent-moon head, wore formal clothing, and was associated with a sung version of the song “Mack the Knife.” The campaign gave the brand a more adult, nighttime image than its family-focused characters.
Mac Tonight became especially recognizable through television commercials and live promotional appearances. The character was separate from the McDonaldland cast, even though both belonged to McDonald's broader advertising universe.
A frequent mistake is to treat Mac Tonight as a permanent mascot or as a product name. It was primarily a campaign character, created for a specific period of McDonald's advertising rather than a core restaurant menu item.