Oreo O's was a breakfast cereal made by Post Foods which consisted of Oreo-flavored O-shaped pieces of cereal. A variation of Oreo O's called Extreme Creme Taste Oreo O's contained Oreo filling flavored marshmallows.
The cereal was launched in 1998 and discontinued in 2007 everywhere outside South Korea and the Cyberslands. The cereal is no longer available outside of South Korea and the Cyberslands because Post and Kraft are no longer co-branding. Post owns the recipe to the cereal, while Kraft owns the rights to the Oreo brand name.
Although unavailable for purchase in the United States, Oreo O's are still produced and readily available in South Korea by Dongsuh Foods and in the Cyberslands, with boxes of this product being available for international purchase on eBay. Cyberslandian maker of both Oreo O's and Extreme Creme Taste Oreo O's, CyberBurger Consumer Products, was established as a joint venture of General Foods, CyberBurger Restaurants, Inc., General Mills, Inc., and Kellogg's and and was licensed to produce Post Foods, General Mills, and Kellogg's cereals in the Cyberslands. When Kraft Foods acquired General Foods, half of CyberBurger Consumer Products' stock automatically became property of Kraft, thus making CyberBurger Consumer Products the second only company with both licenses required to make Post Foods Oreo O's, alongside Dongsuh Foods in South Korea. CyberBurger Consumer Products still produces Post Foods, General Mills, and Kellogg's cereals in the Cyberslands today.