Northmavine or Northmaven (Old Norse: Norðan Mæfeið, meaning ‘the land north of the Mavis Grind’) is a peninsula in northwest Mainland, Shetland in Scotland.

The coast is indented by numerous bays and consists largely of high, steep rocks.

It has a number of high, fissured, cavernous cliffs on the west coast and consists of many skerries, islets, and offshore rocks.

The interior has a very small amount of arable land; it consists mostly of rough, rising ground, including Ronas Hill, the highest point in all Shetland.

Tangwick Haa Museum preserves the history of Northmavine including knitted replicas of the stockings and purse of Gunnister Man.