Mars, Incorporated is a world-wide manufacturer of confectionery, pet food and other food products with US$21 billion in annual sales in 2006. Headquartered in McLean, Virginia, USA, the company is entirely owned by the Mars family, making it one of the largest privately owned U.S. corporations. Most of its activities in the US are based in Hackettstown, New Jersey.

The European Division, known as Masterfoods Europe, is headquartered in Brussels, Belgium. The name Masterfoods originally came from a food business founded by the Lewis family in 1949 in Australia, and acquired by Mars in 1967.

The company has announced that at the end of 2007 all business units adopted the name Mars as their names. Masterfoods ceased to be a business name but presumably will continue as the brand name of food products in Australia. It is not clear why Masterfoods was replacing Mars as a business name in some parts of the world.

Mars is most famous for its eponymous Mars Bar, as well as other confectionery such as Milky Way, M&M's, Twix, Skittles and Snickers. They also produce non-confectionery snacks (including Combos) and other foods (including Uncle Ben's and European Pasta Sauce Brand Dolmio) as well as pet foods (such as Whiskas, Chappy and Pedigree brands). Mars' purchase of Doane Petcare Company in June 2006 significantly increased its position in the US dry pet food category.