Cheerios is a brand of cereal manufactured by General Mills in the United States and Canada, consisting of pulverized oats in the shape of a solid torus. In some countries, including the United Kingdom, Cheerios is marketed by Cereal Partners under the Nestlé brand; in Australia and New Zealand, Cheerios is sold as an Uncle Tobys product. It was first manufactured in 1941 as CheeriOats.

Breakfast cereal is a breakfast food made from processed cereal grains. It is traditionally eaten as part of breakfast, or a snack food, primarily in Western societies.