What is the main spirit used in a Manhattan cocktail?

The Manhattan cocktail is classically made with whiskey, which is the defining spirit of this drink. Typically, rye whiskey or bourbon is used, contributing its rich and robust flavor profile, which balances well with the sweet vermouth and the aromatic bitters that are also essential components of the cocktail.

In a Manhattan, the whiskey not only serves as the primary base spirit but also plays a crucial role in establishing the overall character of the drink. The combination of whiskey and sweet vermouth creates a harmonious blend that is both warming and sophisticated. The cocktail's origins trace back to the late 19th century, underscoring the historical significance of whiskey in classic cocktail culture.

Other choices like rum, gin, and vodka are not relevant here because they belong to different cocktail families and do not align with the traditional recipe or flavor profile of a Manhattan. For instance, rum is commonly found in tropical cocktails, gin is the base spirit in drinks like the gin and tonic or martini, and vodka is often used in lighter cocktails or as a neutral spirit in mixed drinks but does not feature in the Manhattan at all. Thus, whiskey stands out as the essential ingredient in crafting an authentic Manhattan.