Porthania is a university building located in the center of Helsinki, Finland.

Designed by Aarne Ervi and completed in 1957,[1] it is one of the notable modernist buildings from the 1950s in the center of Helsinki.

The building is named after Henrik Gabriel Porthan and is currently mainly used by the Faculty of Law.

The heart of Porthania is the two-storeys high central hall which is decorated by two large murals by Arvid Broms and Olli Miettinen.

The upper five floors of Porthania house smaller auditoriums and offices.