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Plön (German pronunciation: [ˈpløːn] ) is a district in Schleswig-Holstein, Germany. It is bounded by (from the east and clockwise) the districts of Ostholstein and Segeberg, the city of Neumünster, the district of Rendsburg-Eckernförde, the city of Kiel and the Baltic Sea.

Lammershagen is a municipality in the district of Plön, in Schleswig-Holstein, Germany.

Martensrade is a municipality in the district of Plön, in Schleswig-Holstein, Germany.

Lebrade is a municipality in the district of Plön, in Schleswig-Holstein, Germany.

The Lebrade Pond Bird Sanctuary (German: Vogelfreistätte Lebrader Teich) is a nature reserve in the north German state of Schleswig-Holstein, that lies within the district of Plön, about 7 kilometres north of the town of Plön. The reserve is part of the Holstein Switzerland Nature Park and covers an area of about 144 hectares (360 acres). It has been designated as a Special Area of Conservation and therefore is part of the Natura 2000 network. It has a length of about 1.7 kilometres and a width of about one kilometre.

Selent is a municipality in the district of Plön, in Schleswig-Holstein, Germany. It is situated at the southern bank of the Selenter See.

Lehmkuhlen is a municipality in the district of Plön, in Schleswig-Holstein, Germany.

The Arboretum Lehmkuhlen (50 hectares) is an arboretum maintained by the Guts- und Forstverwaltung Lehmkuhlen. It is located in Lehmkuhlen, Schleswig-Holstein, Germany, and open by appointment only.The arboretum was created between 1911-1928 by Cosmos von Milde under Conrad Hinrich IV. Freiherr von Donner, who planted approximately 1500 tree specimens from around the world. Today the arboretum contains about 3200 individual plants of approximately 1000 specimens, including mature specimens of Abies grandis, Abies nordmanniana, Fraxinus ornus, Juglans ailantifolia, Mespilus germanica, Quercus alba, Quercus castaneifolia, Quercus dentata, and Quercus trojana. A municipal cemetery has been created in its northwestern corner.

The Selenter See () is the second-largest lake in the North German state of Schleswig-Holstein, after the Großer Plöner See. It lies at an elevation of 37 m above sea level (NN) and has an area of 22.4 km². The Selenter See, which lies near the village of Selent in the district of Plön, is 34 m deep. The lake drains into the Baltic Sea through the Hohenfelder Mühlenau, only 10 km long, to the north and by the Salzau to the northwest. The formation of the Selenter See goes back to the ice sheets of the Weichselian glaciation, which hollowed out a basin and simultaneously formed ridges of terminal moraine up to 132 m high in the east and 90 m high in the south. From a geological point of view the lake is a so-called "tongue basin lake" or Zungenbeckensee. The lake is well-known inter alia for plentiful supply of fish such as eel, perch, pike, and large and small whitefish and large quantities of roach.

Grebin is a municipality in the district of Plön, in Schleswig-Holstein, Germany. The districts of Behl, Breitenstein, Kakelsberg, Görnitz, Treufeld and Schönweide, which was incorporated in 1974, belong to Grebin.

Trenter See is a lake in Lehmkuhlen, Kreis Plön, Schleswig-Holstein, Germany. At an elevation of, its surface area is 0.107 km2.

Trammer See is a lake in Kreis Plön, Schleswig-Holstein, Germany. At an elevation of 20.03 m, its surface area is 1.63 km².