Emmerthal is a municipality in the Hameln-Pyrmont district, in Lower Saxony, Germany. It is situated on the river Weser, approximatively 6 km south of Hameln. Its seat is in the village Kirchohsen.
In 1973, the Emmerthal was formed by merging the previously independent municipalities of Amelgatzen, Bessinghausen, Börry, Brockensen, Emmern, Esperde, Frenke, Grohnde, Hagenohsen, Hajen, Hämelschenburg, Kirchohsen, Latferde, Lüntorf, Ohr, Voremberg, Welsede.
The Grohnde Nuclear Power Plant is located in the Emmerthal.
From 1933 to 1937, a field on the nearby hill of the Bückeberg was the place where the national socialists celebrated the national thanksgiving festival.