The Swiss authorities online
How you can lose your Swiss citizenship and how can you regain it.
You can apply to have your Swiss citizenship reinstated if you have lost it for any of the following three reasons:
Loss of Swiss citizenship
Under certain circumstances, you may lose your Swiss citizenship:
For legal reasons:
By official decree:
See the State Secretariat for Migration website for details.
Cantonal and communal regulations provide for the loss of cantonal and communal citizenship in certain cases (such as multiple citizenships). This is possible as long as your Swiss citizenship is not affected.
If you have lost your Swiss citizenship, you can apply within ten years to have it reinstated. After this ten-year period has expired, you can only have your Swiss citizenship reinstated if you have been living in Switzerland for three years.
The other requirements are explained on the SEM website, in the Citizenship Manual (Chapter 7: Reinstatement of Citizenship), in the Information sheet on reinstatement of citizenship and in the FAQs on reinstatement of citizenship. The information is not available in English.