Mars is a variety of chocolate bar produced by Mars, Incorporated. It was first manufactured in 1932 in Slough, England by Forrest Mars, Sr. The bar was sold in two different formulations. In its original British version, the bar consisted of caramel and nougat coated with milk chocolate, developed to resemble the American chocolate bar known as the Milky Way, which had been introduced a decade earlier.

An American version of the Mars Bar was produced which had nougat and toasted almonds covered in milk chocolate; later, caramel was added to the recipe as well. The American version was discontinued in 2002 and then revived the following year under the name "Snickers Almond".

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