Yes, cousin marriage is legally permitted in Finland under strict conditions. The Marriage Act (2014/503) allows first-cousin unions if both parties are at least 18 years old, mentally competent, and provide written consent. No additional permits are required, but registrars may request genetic counseling if concerns arise about potential hereditary risks.
Key Regulations for Cousin Marriage in Finland
- Age and Consent: Both parties must be 18+ and capable of consent under the Marriage Act (Chapter 1, Section 1).
- No Prohibited Degrees: First cousins are the only relatives permitted to marry; closer relations (e.g., siblings) are explicitly banned under the Penal Code (39/1889, Chapter 20, Section 11).
- Registrar Discretion: Local civil registrars (Digi- ja väestötietovirasto) may advise genetic counseling if hereditary risks are suspected, though this is not mandatory.
Finland’s 2026 amendments to the Population Information System Act (766/2023) reinforce these rules by digitizing marriage applications, requiring digital identity verification to prevent fraud. The Finnish Institute for Health and Welfare (THL) provides non-binding guidelines on consanguinity risks, but compliance remains voluntary. Violations of marriage laws are prosecuted under the Penal Code, with annulment possible if consent was coerced or fraudulent.