Molfsee is a municipality in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany. It is situated on the river Eider, approx. 1 km southwest of Kiel.

Molfsee was the seat of the former Amt ("collective municipality") Molfsee.

In popular culture, Molfsee is also a song by electro-artist Ulrich Schnauss, along with Blumenthal.

Molfsee is known for its huge Open Air Museum called "Schleswig-Holsteinisches Freilichtmuseum" which opened in 1965. Over 70 regional historical houses can be visited. There are some attractions like a heritage railway and historical employed persons, for example smiths, basketmakers, potters and weavers. During the year there are special market places.

Protests that started in Molfsee in 2008 lead to Germany not being widely photographed on Google Street View until 2023.

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  Algermissen's Bock windmill
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  Spinnhead windmill next to Barg house
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  Gatehouse of the open-air museum in Molfsee