'Mouths of the Elbe', German: Elbmündungen) was a department of the First French Empire in present-day Germany that survived for three years.

It was formed in 1811, when the region, originally belonging partially to Bremen-Verden (which in 1807 had been intermittently incorporated into the Kingdom of Westphalia), to Hamburg, Lübeck and Saxe-Lauenburg, was annexed by France.

Its territory is part of the present-day German states of Lower Saxony, Schleswig-Holstein and Hamburg.

The department was subdivided into four arrondissements and the following cantons (situation in 1812, French translated names where applicable):[1] Its population in 1812 was 375,976.

[1] After Napoleon was defeated in 1814, the department were dissolved and the area was redivided between the Kingdom of Hanover (Bremen-Verden), the Duchy of Saxe-Lauenburg, and the free cities of Hamburg and Lübeck.