The «Oreo Biscuit» was first developed and produced by the National Biscuit Company (today known as Nabisco) in 1912 at its Chelsea, Manhattan factory in the current-day Chelsea Market complex, located on Ninth Avenue between 15th and 16th Streets. Today, this same block of Ninth Avenue is known as «Oreo Way.» The name Oreo was first trademarked on March 14, 1912. It was launched as an imitation of the Hydrox cookie manufactured by Sunshine company, introduced in 1908

Oreo cookies are distributed worldwide through a variety of sales and marketing means. In the United Kingdom, since May 2008, following stocking of Oreo (called Oreo biscuits in UK) in the supermarket chain Sainsbury's, Kraft decided to fully launch the Oreo across the UK, repackaged in the more familiar British tube design, accompanied with a £4.5M television advertising campaign around the 'twist, lick, dunk' catchphrase.

Oreo (/ˈɔːrioʊ/) is a commercial brand of cookie consisting of two chocolate wafers with a sweet creme filling in between, and (as of 1974) are marketed as «Chocolate Sandwich Cookies» on the package. The version currently sold in the United States is made by the Nabisco division of Mondelēz International. Oreo has become the best-selling cookie in the United States since its introduction in 1912

Oreo most commonly refers to a cookie produced by Nabisco.
Oreo may also refer to:
Oreo (novel), a novel by Fran Ross
Oreosomatidae, a family of fish commonly called oreos
Oreo (genus), a spider genus of the family Gallieniellidae
Oreo Collins, a housecat who received a high school diploma
The Oreo, a sculpture on the Villanova University campus
Acronym for «Other Real Estate Owned,» real estate a bank owns that has generally been acquired through foreclosure
Oreo cookie, an ethnic slur for a black person who «acts white» (black on the outside, white on the inside, like an Oreo cookie)
Oreo O's, a discontinued cereal based on the Oreo cookie
A variant of Rock Paper Scissors in which the loser has to ask out a person of the winner's choice
Android Oreo, a version of the operating system for smartphones etc.

«Milk's favo[u]rite cookie»
«Only Oreo»