B-52 is a layered cocktail that was invented in Banff, Canada in 1977, and was allegedly named after the long-range bomber used by the Americans during Vietnam War. It consists of coffee liqueur (usually Mexican Kahlúa), Irish cream (usually Baileys), and Grand Marnier orange liqueur.

In some versions, Grand Marnier can be replaced with triple sec, Amaretto, Cointreau, or even absinthe. If prepared correctly, the elements are built in a shot glass, and the layers should be visible, with coffee liqueur on the bottom and orange liqueur on top.

The classic B-52 version is served neat in a shot glass, while the variation known as Flaming B-52 usually comes with a top layer of rum, which helps to ignite the flame.