Sömmerda (German: Landkreis Sömmerda) is a Kreis (district) in the north of Thuringia, Germany.

In 1994, the districts of Thuringia were reorganized, and the district Sömmerda was enlarged significantly by adding municipalities from the dissolved districts Artern and Erfurt-Land.

The main river in the district is the Unstrut.

The nearby town of Kölleda is known locally as the Peppermint City because of its long history of growing aromatic and medicinal herbs.

The coat of arms shows the three historic states which Sömmerda belonged to in the past.