OO or oo may refer to:
Udagamandalam (also Ootacamund ( listen ))and abbreviated as Udhagai and Ooty ( listen is a town and municipality in the Indian state of Tamil Nadu.
Oops!... I Did It Again is the second studio album by American singer Britney Spears, released on May 16, 2000 by Jive Records.
The Oort cloud ( or , named after the Dutch astronomer Jan Oort), sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals believed to surround the Sun to as far as somewhere between 50,000 and 200,000 AU (0.8 and 3.2 ly).
Oobi is an American children's television series created by Josh Selig of Little Airplane Productions.
Oophorectomy (from Greek ᾠοφόρος, ōophóros, "egg-bearing" + ἐκτομή, ektomḗ, "a cutting out of") is the surgical removal of an ovary or ovaries.
Oopiri (English: Breath) is a 2016 Indian comedy-drama film directed by Vamsi Paidipally. A remake of Olivier Nakache & Éric Toledano's French comedy-drama The Intouchables (2011), the film was produced by Prasad V.
Ooredoo (Arabic: أوريدو; formerly Qtel) is an international telecommunications company headquartered in Doha, Qatar.
"Oops!... I Did It Again" is a song by American singer Britney Spears, from her second album of the same name.
Oona O'Neill Chaplin, Lady Chaplin (May 14, 1925 – September 27, 1991) was the daughter of Nobel and Pulitzer-Prize-winning American playwright Eugene O'Neill and English-born writer Agnes Boulton, and the fourth and last wife of English actor and filmmaker Charlie Chaplin.