EMSO may refer to:
* EMŠO, the Slovenian
Unique Master Citizen Number.
*
EMSO simulator, a software package whose name stands for "Environment for Modelling, Simulation and Optimisation"
* The orchestral component of the
European Medical Students' Orchestra and Choir
*
European Multidisciplinary Seafloor and water column Observatory, a European research infrastructure
* Existential
monadic second-order logic, a fragment of second-order logic in which all second-order quantifiers must be existential quantifiers over sets
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