IMO or Imo may refer to:
Maritime
- International Maritime Organization
- IMO number, a unique identity number issued to seacraft (pattern "1234567")
 
 - SS Imo, a 1889 ship involved in the Halifax Explosion
 
Meteorology
Other
- Irish Medical Organisation, the main organisation representing doctors in Ireland
 - Intelligent Medical Objects, a privately held company specializing in medical vocabularies
 - Isomaltooligosaccharide, a mixture of short-chain carbohydrates which has a digestion-resistant property
 - Idiopathic Massive Osteolysis, a name for Gorham's disease, a rare bone disease
 - International Mathematical Olympiad
 - International Meteor Organization
 - Imo State, Nigeria
 - imo.im, a video calling and instant messaging app
 - IMO (in my opinion), an Internet slang expression
 
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