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

A linear settlement, it is located west of the town, to the south of Wilhelmsfehn I.

In that year, canals reaching into the Ostfriesische Zentralhochmoor ("East Frisian central raised bog") such as the Norderwieke and the Süderwieke were extended eastwards.

The reason for this is seen as changed economic conditions, especially the decline of the peat shipping that had been intensively operated until then.

In 1931, the village, which remained an estate district (Gutsbezirk) under municipal law, received its own school.