IMO

The three-letter acronym IMO may refer to: International Maritime Organization
IMO ship identification number, unique identity numbers issued to seacraft (pattern "IMO 1234567")
International Meteorological Organization
International Meteor Organization
In my opinion, variant of Internet slang term IMHO
Idiopathic Massive Osteolysis, a name for Gorham's disease
Independent Market Operator of Ontario, Canada—now the Independent Electricity System Operator (IESO)
International Mathematical Olympiad
Irish Medical Organisation, the main organisation for Doctors in the Republic of Ireland

The word ‘Imo’, where the first letter is capitalised, may refer to: Imo State, a state in Nigeria
the Imo, a ship involved in the Halifax Explosion

Translation

The word "IMO" occurs as such in the following languages: English, Czech, Danish, German, Esperanto, Korean, Italian, Hungarian, Japanese, Norwegian (Bokmål), Polish, Russian, Slovenian, Finnish, Swedish, Vietnamese, Chinese.

Translation in French: Imo.