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The official list of social security institutions in the EU is administered by the European Commission. It is available in all official languages.
The list is comprehensive and intuitive. All you have to do is to enter the country in which you want to find a social security institution, or add a keyword and select Search. You will see the institution you are looking for with current contacts.
Social security institutions in the EU can be found here: List of social security institutions in the EU (europa.eu).