The main requirements for naturalization are: continuous legal residence in Finland for at least 5 years (4 years if married to a Finnish citizen), sufficient knowledge of Finnish or Swedish (language test or proof of use), clean criminal record, and no outstanding debts to Finnish authorities.
The main requirements for naturalization are: continuous legal residence in Finland for at least 5 years (4 years if married to a Finnish citizen), sufficient knowledge of Finnish or Swedish (language test or proof of use), clean criminal record, and no outstanding debts to Finnish authorities. You apply through Migri.
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The language requirement can be fulfilled by passing an official language test or showing other proof like completed education in Finnish. Processing times are currently long - often 1-2 years. Finnish citizenship gives you an EU passport, full political rights, and security of residence. Finland allows dual citizenship so you often do not have to give up your previous citizenship.