Organizations and Institutes
- IMS International Medical Services, a department of the State University Medical Center Freiburg offering services for foreign patients
- IMS Global, a non-profit standards organization concerned with establishing interoperability for learning systems and learning content
- Indian Mathematical Society
- Indian Medical Service, a military medical service in British India
- Insight Meditation Society, a Buddhist organization located in Barre, Massachusetts
- Institute of Mathematical Statistics, an international professional and scholarly society
- International Magicians Society, the world's largest professional association for magicians
- International music summit, a yearly dance music event held in Ibiza
- International Mountain Society, an association for mountain research in Bern, Switzerland
- Irish Marching Society, a group of individuals in the city of Rockford, Illinois who wanted to come together to celebrate the Irish Heritage
- Irish Mathematical Society, the main professional organization for mathematicians in Ireland
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