OO or oo may refer to:
Oo (digraph), a digraph in orthography
Oô, a
Commune in FranceOO gauge, a 1:76.2 modelling scale in model railroading
‘Ō‘ō, an extinct bird of the genus Moho
Object-oriented, a type of computer programming
Original Oratory, a competitive event in high school forensic competitions
SkyWest, IATA code OO
Oakley, Inc., NYSE stock ticker symbol OOOscillation Overthruster (OO), a Super Flag from the video game
BZFlagOO, the depot code for the carriage shed at
Old Oak Common TMD
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o ... o
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