Italian citizenship may be lost if it is formally renounced by:
- an adoptee who is of legal age, following revocation of the adoption for reasons attributable to the adopter, provided that he or she holds or reacquires another citizenship (art. 3, paragraph 4 of Law no. 91/92);
- an Italian citizen, who resides, or establishes their residence abroad and who possesses, acquires or reacquires another citizenship (art. 11 of Law no. 91/92);
- an adult who acquired Italian citizenship as a minor following the acquisition or reacquisition of citizenship by one of the parents, provided that he or she holds another citizenship (art. 14 of Law no. 91/92).
The declaration of renunciation of citizenship must be submitted, in the case of residence abroad, to the competent Consular Office. It must be accompanied by the following documentation:
- birth certificate issued by the relevant Italian municipality;
- certificate of Italian citizenship;
- documentation proving possession of foreign citizenship;
- documentation relating to residence abroad, if required.
A minor does NOT lose Italian citizenship if one or both parents lose it or reacquire a foreign citizenship.