Martfeld is a municipality in the district of Diepholz, in Lower Saxony, Germany.

It is part of the Bruchhausen-Vilsen (Samtgemeinde) Collective Municipality.

Martfeld is located approximately 36 km southeast of Bremen.

Neighboring communities are Schwarme and Bruchhausen-Vilsen The following places belong administratively to Martfeld: The village was first mentioned in a papal document personally signed by Pope Alexander III in 1179.