Estonian citizenship is a legal covenant between the Estonian citizen and the Estonian state that entails rights and obligations for both parties. No one may be deprived of citizenship by birth.
- is acquired by birth if at least one parent has Estonian citizenship
- is obtained through naturalization
- is reinstated in the case of persons who lost Estonian citizenship as minors
- is lost by way of release of Estonian citizenship, depriving one of citizenship or by accepting the citizenship of another country.
An Estonian citizen may not simultaneously hold the citizenship of any other country. Estonian citizenship is lost by accepting the citizenship of another country. A child may hold more than one citizenship if his or her parents have different citizenships. But upon reaching 18 years of age, a child must within three years give up either his or her Estonian citizenship or that of the other country.