West Harbour (Finnish: Länsisatama, Swedish: Västra hamnen) is a passenger and cargo harbour in the Jätkäsaari district of Helsinki, Finland, in the southwestern part of the Helsinginniemi peninsula. The Länsisatama harbour area also includes the Munkkisaaren laituri pier on the west side of Munkkisaari, used by cruiseliners. The harbour is operated by the Port of Helsinki.

It has two passenger terminals: West Terminal 1 (Finnish: Länsiterminaali 1, Swedish: Västra terminalen 1) and West Terminal 2, which opened in February 2017. West Terminal 1 is used mainly by passenger ships from Helsinki to Saint Petersburg. West Terminal 2 is specialised in fast scheduled traffic to Tallinn, Estonia. As of 2024, Tallink and Eckerö Line operate routes to Tallinn.

The passenger terminals are served by Helsinki tram lines 7 and 9.^[1]

The construction of a new residential area in Jätkäsaari continues as of November 2023^[update], using land freed up after the container traffic in West Harbour was moved to Vuosaari Harbour in 2008.

Immediately next to West Harbour, in the Munkkisaari quarter, there is the Helsinki shipyard in Hietalahti. However, it is not counted as part of the harbour area of Länsisatama.

Länsisatama is also the name of a subdivision of Helsinki, which encompasses a larger area than the harbour alone.