The whiskey sour is a mixed drink containing whiskey (often bourbon), lemon juice, sugar, and optionally, a dash of egg white. It is a type of sour, a mixed drink with a base spirit, citrus juice, and a sweetener.

With egg white included, it is sometimes called a Boston Sour; when the whiskey used is a scotch, it is called a Scotch Sour. With a few bar spoons of full-bodied red wine floated on top, it is often referred to as a New York Sour. It is shaken and served either straight up or over ice.

The traditional garnish is half an orange slice and a maraschino cherry. The original version is made with Limón de Pica.

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