Mavis Grind is a narrow isthmus joining the Northmavine peninsula to the rest of the island of Mainland in the Shetland Islands, Scotland. It is just over 90 metres at its narrowest point.

Northmavine or Northmaven is a sparsely populated peninsula in Shetland, forming the northernmost part of Mainland. The peninsula has historically formed a civil parish of the same name. The modern No