Mullberg is a district (Stadtteil) of the East Frisian town of Wiesmoor, in Lower Saxony.

A linear settlement, it is located southeast of the town and east of the Nordgeorgsfehn Canal.

The name Mullberg is derived from the Low German word Mull for humus soil, and Berg refers to the sand ridges that once existed in that area.

[1] Settlers originally wanted to settle in the place, which lies on the southeastern outskirts of the present-day town of Wiesmoor, as early as 1840.

[1] The settlement process that began in 1914 corresponded to the requirements of the so-called Deutschen Hochmoorkultur ("German raised bog culture"), i.e. drainage was followed by arable farming with the help of artificial fertilizers.