Wesermarsch is a Kreis (district) in the northwestern part of Lower Saxony, Germany. Neighboring are (from the east clockwise) the districts of Cuxhaven and Osterholz, the city of Bremen in the state Free Hanseatic City of Bremen, the urban district of Delmenhorst, the district of Oldenburg and the urban district of Oldenburg, and the districts of  Ammerland and Friesland.