IMO

The three-letter abbreviation IMO may have several meanings, depending on context:

• Idiopathic Massive Osteolysis (Gorham's Disease)
• In my opinion – Internet slang
• Institute for Marketecology
• Intermediate Mathematical Olympiad, a challenge for students aged 11-16 organised by the United Kingdom Mathematics Trust
• International Maritime Organization
• International Mathematical Olympiad
• International Meteor Organization
• International Meteorological Organization
• International money order
• International Muslims Organization
• Independent Market Operator of Ontario, Canada
• Irish Medical Organisation (a labor union)
• Instituto de la Mujer Oaxaqueña
• Irongate Mail Order and industrial electronics company founded by Maurice Hatter based in London, UK
• In Memory Of
• IMO Independent Mobile

The word ‘Imo’, of which only the first letter is capital, may also refer to:

• Imo State, Nigeria
• The World War I-era Belgian-Relief ship Imo involved in a collision with the French munitions ship Mont Blanc in Halifax Harbour, Nova Scotia, Canada, the result of which caused the Halifax Explosion.
• A Japanese language slur equivalent to "country bumpkin" (Lit. Potato)