The Wesachewan River is a short river in the Hudson Bay drainage basin in Census Division No. 22 - Thompson-North Central, Northern Region, Manitoba, Canada. It flows 2.5 kilometres (1.6 mi) out of Vermilyea Lake via twin channels which combine at 54°30′31″N 94°44′28″W / 54.50861°N 94.74111°W, then flows over the Namaykos Rapids, and empties into Wesachewan Bay on Gods Lake. The main channel from Vermilyea Lake is the east channel, given as the primary source in the Infobox at right, which is straighter and 1.8 kilometres (1.1 mi) shorter than its twin (1.25 kilometres or 0.78 miles versus 3.05 kilometres or 1.90 miles), the west channel, given as the secondary source. The length of the river given in the Infobox is the length using the shorter east channel.
The river's waters eventually flow via the Gods River and the Hayes River into Hudson Bay.