Wietmarschen is a unitary municipality (Einheitsgemeinde) in the district of Grafschaft Bentheim in Lower Saxony, Germany. It is split into the villages of Wietmarschen, Füchtenfeld, Schwartenpohl, Lohnerbruch, Nordlohne and Lohne with Lohne being the biggest and having the town hall while Wietmarschen, which is the second biggest, having the name.