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North Tolsta is a village in the Scottish Outer Hebrides, on the east side of the Isle of Lewis. North Tolsta is within the parish of Stornoway. Tolsta is notable for its long sandy beach Gleann Tholastaidh. At the end of Tolsta's long sandy beach there are five caves, only visitable during low tide. They are known locally as "The Caves of Life." The village of Bail' is to the north. The village has a two churches and a post office and community shop ("Buth Tholastaidh").

At the end of Gleann Tholastaidh is one of the few possible medieval castles on the Isle of Lewis, Caisteal a' Mhorair (the Castle of the Big Man, or Nobleman). The site was first recorded in 1874 in the Proceedings of the Society of Antiquaries by Peter Liddel. It was last surveyed in the early 2000s by The Severe Terrain Archaeological Campaign.

In, the now drained, loch at Osavat is a Crannog.