Fimbulheimen is a mountain range in Queen Maud Land, Antarctica.

The name comes from Fimbulvetr, the harsh winter immediately preceding Ragnarok in Norse mythology.

A number of smaller ranges and mountain areas constitutes Fimbulheimen, from west to east:

Large parts of the area were mapped by the Norwegian Antarctic Expedition 1956-60.

The Norwegian Polar Institute has published twelve map sheets of Fimbulheimen in scale 1:250 000.