Lac d'Enghien is a freshwater lake in France.

Lac d'Enghien is in the Île-de-France region, approximately seven miles north of Paris.

Administratively it belongs to the commune of Enghien-les-Bains in the department of Val-d'Oise.

[1] The lake is roughly 350 metres (1,150 ft) wide and 930 metres (3,050 ft) long, with a circumference of 3.09 kilometres (1.92 mi) and a total surface area of 43 hectares (110 acres).

[2] The lake water is replenished by several small streams: the Corbon, Haras, d'Ermont, and d'Andilly, all of them under 8 kilometres (5.0 mi) long .