Lauttasaari (Drumsö in Swedish) is an island and city-district of Western Helsinki, about 6 kilometers West of the city centre.

With a population of 19.000, Lauttasaari is primarily a residential area but also contains services, including several marinas and canoe clubs. Although close to the city centre, Lauttasaari is noted for its preserved forest areas and rocky outcrops.

The highway Länsiväylä, linking central Helsinki with Espoo, passes through Lauttasaari.

Lauttasaari was a largely undeveloped part of the borough of Hoplax (Finnish: Huopalahti ) until that borough was annexed to the city of Helsinki in January 1, 1946.