Smoothie King Franchises Inc. is an American privately held company that operates a chain of retail stores that specialize in selling smoothies. Founded in 1973, the company was bought by a South Korean franchisee in 2012. In the late 2010s, the company was focusing on whole and unmodified ingredients.

A smoothie is a beverage made by puréeing ingredients in a blender. A smoothie commonly has a liquid base, such as fruit juice or milk, yogurt or ice cream. Other ingredients may be added, including fruits, vegetables, non-dairy milk, crushed ice, whey powder or nutritional supplements.