Chilean nationality law is based both on ius soli and ius sanguinis. In terms of acquiring Chilean nationality after birth, this is possible through nacionalización (naturalisation) and nacionalización por gracia, that is, Chilean nationality granted by law passed in Congress for special cases. In order to satisfy the requirements for naturalisation, those interested must meet the following criteria: be at least 21 when applying, have 5 or more years of continued residence in Chile, hold a definitive residence permit, have no criminal record, and show proof of financial means to live in the country.
According to Chilean legislation, being married to a Chilean national or having a child born on Chilean soil does not facilitate the naturalisation process, and only paves the way for residence permits.
Dual and multiple citizenship are both allowed according to Chilean law. Any Chilean citizen acquiring second citizenship will not lose their original citizenship. Reciprocally, foreign nationals who acquire Chilean citizenship are not required to renounce their original nationality. Chilean citizens are not required to register or justify their dual citizenship status.