Naosap Lake is a glacial lake in Canada, located approximately 28 kilometres (17 mi) northeast of Bakers Narrows, Manitoba.

As the source of the Mistik Creek, it is part of the Nelson River watershed, in the Hudson Bay drainage basin in the Northern Region of Manitoba.

The surrounding mixed deciduous and coniferous forest is part of the Churchill River Upland portion of the Midwestern Canadian Shield forests.

[1] The region around the lake consists of rocky parallel ridges with poorly drained areas of muskeg and irregular stony shorelines due to intense glaciation.

[2] The lake is situated on the well known "Mistik Creek Loop," a remote canoe route of 80 kilometres (50 mi).