Leer is a district (Landkreis) in Lower Saxony, Germany.

The District is located in the southern part of East Frisia. The Ems River runs through the District, coming out of the Emsland in the south and flowing into the Dollart, a bay of the North Sea. The island of Borkum, belonging to the East Frisian Islands, is also a part of the District. Some of the area of the District is in the Lower Saxony Wadden Sea National Park.