The Barren Ground Shrew or Barrenground Shrew, Sorex ugyunak, is a small shrew found in northern Canada west of Hudson Bay and in Alaska. At one time, this species was considered to be a subspecies of the similar Masked Shrew, S. cinereus. It is similar in appearance and thought to be closely related to the Saint Lawrence Island Shrew (S. jacksoni) and Pribilof Island Shrew (S. hydrodromus).

It is dark brown on its back with grey-brown sides and underparts; the tail is pale brown on top and light below with a light brown tip. Its body is about 8 cm in length including a 3 cm long tail. It weighs about 4 g.

These animals are found north of the tree-line, in wet meadows or thickets in the tundra.

They eat insects, small invertebrates and seeds.

The species name ugyunak is the Inuit word for "shrew".