Arendsee (German pronunciation: [ˈaːʁəntseː]) is a town in the Altmarkkreis Salzwedel, Saxony-Anhalt, Germany.

The town Arendsee consists of Arendsee proper (including the Ortsteile Genzien and Gestien) and the following Ortschaften or municipal divisions:[3] The locality and the lake were first mentioned in the Royal Frankish Annals in 822.

In 1184 Otto I, Margrave of Brandenburg founded a Benedictine nunnery in Arendsee while the then competent Prince-Bishop of Verden, Tammo (d. 1188), endowed it with estates.

The former municipalities Binde, Höwisch, Kaulitz, Kerkau, Kläden, Kleinau, Leppin, Neulingen, Sanne-Kerkuhn, Schrampe, Thielbeer and Ziemendorf were merged into Arendsee on 1 January 2010.

[4] The former municipalities Fleetmark, Mechau, Rademin and Vissum were merged into Arendsee on 1 January 2011.