European route E12 is a road that is part of the International E-road network.

It begins in Mo i Rana, Norway, transverses Sweden and ends in Helsinki, Finland, with a ferry line between Sweden and Finland.

The part within Finland is Finnish national highway 3.

The ferry service between Holmsund and Vaasa is operated by Wasa Line using the M/S Aurora Botnia, with up to two daily departures in each direction taking about three and a half hours.

[1] The European route E12 from Mo i Rana to Vaasa is part of the Blue Highway, which is an international tourist route from Norway to Russia via Sweden and Finland.