Blåmannsisen

or () is the fifth-largest glacier in mainland Norway. It is located on the border of Fauske Municipality and Sørfold Municipality in Nordland county, Norway—just west of the border with Sweden.

Its highest point is above sea level and its lowest point is at an elevation of . Three outlet glaciers extend from the icecap. A small outlet spills over a subglacial ridge to the north damming an unnamed lake resulting in occasion outburst floods. To the east a large outlet extends towards the lake, Leirvatnet. A further outlet descends steeply to the west. The western and northern outlets are heavily crevassed, as is the snout of the eastern glacier calving into Leirvatnet. The glacier also calves into lake Blåmannsisvatnet, resulting in extensive crevasses in the glacier above that lake. Given the degree of crevassing at the margins, traversing the glacier can be dangerous, particularly in late spring or early summer when snow bridges may be weak.