Ekenäs, or Tammisaari in Finnish, is a municipality of Finland.
It is located in the province of Southern Finland and is part of the Uusimaa region. The municipality has a population of 14,521 (2004-12-31) and covers an area of 746.88 km² (excluding sea) of which 25.55 km² is inland water. The population density is 20.14 inhabitants per km².
The municipality is bilingual, with the majority being Swedish and the minority Finnish speakers.
It is noted for its archipelago, part of which is a national park.
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