IMO or Imo may refer to:

Maritime

International Maritime Organization The International Maritime Organization (IMO; ; ) is a List of specialized agencies of the United Nations, specialized agency of the United Nations responsible for regulating maritime transport. The IMO was established following agreement at a ...

IMO number The IMO number of the International Maritime Organization is a generic term with two distinct applications: * the IMO ship identification number is a unique ship identifier; or, * the IMO company and registered owner identification number is u ...

, a unique identity number issued to seacraft (pattern "1234567") * SS ''Imo'', a 1889 ship involved in the Halifax Explosion

Meteorology

International Meteorological Organization The International Meteorological Organization (IMO; 1873–1951) was the first organization formed with the purpose of exchanging weather information among the countries of the world. It came into existence from the realization that weather systems ...

Icelandic Meteorological Office Icelandic Meteorological Office (IMO; ) is Iceland's national weather service and as such a government agency under the Ministry of Environment and Natural Resources. It is also active in volcano monitoring, esp. volcano seismology, and, toget ...

Other

Irish Medical Organisation The Irish Medical Organisation ( Irish: ''Ceardchumann Dhochtúirí na hÉireann'' ) is a professional association for doctors in Ireland, and is also a trade union representing doctors in negotiations with the Irish government. The IMO was fo ...

, the main organisation representing doctors in Ireland *

Intelligent Medical Objects Intelligent Medical Objects (IMO) is a privately held company specializing in developing, managing and licensing medical vocabularies. IMO partners with various health care organizations, medical content providers and EHR developers. Founded i ...

, a privately held company specializing in medical vocabularies *

Isomaltooligosaccharide Isomaltooligosaccharide (IMO) is a mixture of short-chain carbohydrates which has a digestion-resistant property. IMO is found naturally in some foods, as well as being manufactured commercially. The raw material used for manufacturing IMO is starc ...

, a mixture of short-chain carbohydrates which has a digestion-resistant property * Idiopathic Massive Osteolysis, a name for

Gorham's disease Gorham's disease (pronounced GOR-amz), also known as Gorham vanishing bone disease and phantom bone disease, is a very rare bone disease, skeletal condition of unknown etiology, cause. It is characterized by the uncontrolled proliferation of dis ...

, a rare bone disease *

International Mathematical Olympiad The International Mathematical Olympiad (IMO) is a mathematical olympiad for pre-university students, and is the oldest of the International Science Olympiads. It is widely regarded as the most prestigious mathematical competition in the wor ...

International Meteor Organization The International Meteor Organization (IMO) was formally founded in 1988 from predecessor gatherings over many years. IMO has several hundred members and was created in response to an ever-growing need for international cooperation on amateur and ...

Imo State Imo () is a States of Nigeria, state in the South East (Nigeria), South-East geopolitical zone of Nigeria, bordered to the north by Anambra State, Rivers State to the west and south, and Abia State to the east. It takes its name from the Imo R ...

, Nigeria * imo.im, a video calling and instant messaging app * IMO (in my opinion), an Internet slang expression {{disambiguation