Oreo O's is a breakfast cereal that consists of Oreo-flavored O-shaped pieces of cereal. It was conceived of by an Ogilvy & Mather NYC advertising employee and introduced in 1997 by Post Cereals. In 2001 the cereal got a new recipe with real creme filling.[4] A variation of Oreo O's called Extreme Creme Taste Oreo O's contained Oreo filling-flavored marshmallows.[5]
The cereal was launched in 1997[6] and discontinued in 2007 everywhere other than South Korea.[7] In May 2017, Post Cereals announced that it would restart production of Oreo O's starting June 23 and continue production indefinitely.[8]