If you are only visiting Finland, you will not need a residence permit
If you wish to visit Finland and stay for a maximum of 90 days, you do not need a residence permit. However, in most cases you will need a visa. If you are a citizen of a visa-free country, you are allowed to stay in Finland for 90 days without a visa or a residence permit.
If you are a citizen of an EU Member State, Iceland, Liechtenstein, Norway or Switzerland, you do not need a residence permit for Finland. If you stay for longer than three months, you need to register your right of residence.
Find out if you can work without a residence permit.
Visas are granted by Finnish missions (embassies or consulates). Read more on the website of the Finnish Ministry for Foreign Affairs.