Do Finland passport holders need a visa to visit LT?

No visa. Finnish citizens are EU nationals with full freedom of movement, so they can enter Lithuania for tourism (or any purpose) with just a valid Finnish passport or national ID card, for any length of stay. Finland and Lithuania are both members of the European Union and the Schengen Area. As an EU citizen, a Finnish ordinary passport holder enjoys the right of free movement and does not need a visa to enter Lithuania for tourism, business, study, work or any other purpose. Travel is permitted on either a valid Finnish passport or a valid Finnish national identity card; no entry stamp, registration or fee applies for short visits. Because both countries are inside Schengen, there are normally no systematic checks at the internal border, although Lithuania (and other states) can temporarily reintroduce controls for security reasons, so carrying a valid travel document is always required. The Schengen 90/180-day short-stay limit and the upcoming ETIAS travel authorisation (planned to launch in late 2026) apply only to non-EU visa-exempt nationals; they do NOT apply to Finnish citizens, who may remain in Lithuania indefinitely. If a Finn intends to stay longer than three months, the requirement is not a visa but a simple declaration/registration of residence with the Lithuanian Migration Department, evidencing employment, study, self-sufficiency or family ties. In short, this is one of the simplest possible routes: a Finnish citizen needs only a valid ID document and faces no visa, fee or pre-authorisation.