Grönauer Heide, Grönauer Moor und Blankensee, Nature reserve near Lübeck, Germany

Grönauer Heide, Grönauer Moor and Blankensee is a protected nature reserve near Lübeck that combines heathlands, moors, and a lake. The area contains several distinct habitat types that support different specialized plant and animal species.

The Grönauer Heide was fully wooded until the 14th century, when forests were cleared in the late Middle Ages and the land was partly farmed. Areas left unused were colonised by heather. The reserve itself was designated in 2006 at 354 hectares and enlarged in 2013 by part of the "Schönes Dreieck". The heath had earlier served as a training ground for the federal police and army.

The heath was created by medieval forest clearance and later grazing; today sheep graze the southern part to keep it open. The reserve is managed by the city of Lübeck's Stadtwald and, in the 31-hectare "Schönes Dreieck" area, by the Stiftung Grönauer Heide, founded in 2008 by BUND, NABU and the state conservation association after mediation between the airport, the city and conservation groups.

The southern part of the reserve, looked after by Lübeck's Stadtwald, has some hiking and riding trails; the northern part is not accessible and serves as a retreat for flora and fauna. The 31-hectare area in the "Schönes Dreieck" between Blankensee airport, the Blankensee district and the lake belongs to the Stiftung Grönauer Heide.

The northern part of the reserve is closed to visitors and serves as a retreat for flora and fauna; the southern section is grazed by sheep as part of its management. The reserve also shelters species such as the woodlark, nightjar and moor frog.