Mannerheimintie

thumb|250px|Mannerheimintie in the city centre. thumb|250px|Mannerheimintie and apartment buildings of Meilahti (left) and [[Laakso (right), some north from Erottaja.]]

Mannerheimintie () (previously known as Henrikinkatu, Läntinen ja Itäinen Henrikinkatu, Läntinen ja Itäinen Heikinkatu, Turuntie, Läntinen viertotie, Heikinkatu), colloquially known as Mansku, named after the Finnish military leader and statesman Carl Gustaf Emil Mannerheim, is the main street and boulevard of Helsinki, Finland. It also forms part of the European route E12 and a continuation of the Finnish national road 3.