Koivusaari metro station (Finnish: Koivusaaren metroasema, Swedish: Björkholmens metrostation) is a station located underwater on the Länsimetro extension of the Helsinki Metro.

The eastern entrance to Koivusaari metro station is located on Sotkatie in Lauttasaari.

The western entrance, on the island of Koivusaari itself, had not been taken into use when the Länsimetro was completed, it is waiting until land use in the area has developed enough.

The escalators at Koivusaari metro station are the longest in the entire country in Finland.

[6] On weekdays Koivusaari metro station is visited by 4,600 passengers per day on average, which is the lowest number among all stations of Länsimetro and the entire Helsinki Metro.