Organizations
- Eastern Mountain Sports, an outdoor retailer
- Edinburgh Mathematical Society, a Scottish Mathematical Society
- Electronic Music Studios, a manufacturer of synthesizers
- Elektronmusikstudion, the Swedish national centre for electronic music and sound art.
- Eitzen Maritime Services, a Norwegian company
- EMS Technologies, a United States company
- Environmental Media Services, a Washington, D.C. based nonprofit organization
- European Monetary System, a former European monetary cooperation
- European Mathematical Society, a European Mathematical Society
- European Mortgage Securities, a group of issuers of mortgage-backed securities in the Netherlands
- Grupo EMS Sigma Pharma, a Brazilian pharmaceutical company
- Express Mail Service, an International express postal service network
- Event Marketing Solutions, a UK based provider of vehicle-based marketing roadshows
- European Microscopy Society, a European Microscopy Society
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