Siuntio railway station (Finnish: Siuntion rautatieasema, Swedish: Sjundeå järnvägsstation) is a railway station in the municipality of Siuntio, Finland, between the stations of Kirkkonummi and Ingå.

The Sjundeå station was opened for traffic on 1 September 1903, and its station building, designed by Bruno Granholm, was finished in the same year. The station had its Finnish name officialized in June 1925.

The station was on the area of the territory of the Soviet Porkkala Naval Base, established as a result of the Moscow Armistice in 1944. As Porkkala was returned to Finnish control in 1956, Siuntio was re-established first as a halt on 1 May 1956; it was upgraded to a staffed laiturivaihde — a halt with a railyard with at least one switch — just one month later after the renovation of the station building was completed.

Siuntio is served by line Y on the Helsinki commuter rail network, for which it is one of the termini along with Helsinki. In addition, the H train runs between Hanko and Helsinki three times a week. The station is part of HSL fare zone D. The station has 55 centimetres (22 in) high platforms for accessible entry to low-floor trains, and park and ride services are provided on the south side of the railway in a car park on Ratapihantie, with capacity for approximately 50 cars and 10 bikes.

• Railway lines in Finland

• Media related to Siuntio railway station at Wikimedia Commons
• Train arrivals and departures at Siuntio on Finrail