Sörnäinen Harbour (Finnish: Sörnäisten satama, Swedish: Sörnäs hamn) was for nearly one and a half centuries a major harbour and freight terminal in the Port of Helsinki, located in the Sörnäinen district on the eastern shore of the Helsinki city centre area.

[2] It was opened in 1863 to serve mainly the country's timber export trade, in 1889 an oil import terminal was added, and more recently containerised cargo and some passenger traffic.

[3][4] The only remaining functions relate to the adjacent Hanasaari Power Plant, which is itself being gradually decommissioned.

[2] The port facilities were connected to the rail network at Pasila station via a branch line called Sörnäinen harbour rail, which originally ran through Vallila, but which in 1965 was re-routed around the inner city area via Kumpula.

[5] Since its closure, the harbour area has been redeveloped for residential, retail and leisure use, as part of the Kalasatama development.