Loch Seaforth (Scottish Gaelic: Loch Shiphoirt or Shìophoirt) is a sea loch in the Outer Hebrides of Scotland. It consists of three distinct sections; the most seaward is aligned northwest–southeast, a middle section is aligned northeast–southwest and the inner and most northerly section is aligned east–west. The southern stretch of the loch seaward from Bowglass forms the boundary between Lewis and Harris and was until 1975 the boundary between the traditional counties of Ross and Cromarty and Inverness-shire. The settlement of Rhenigidale lies near the mouth of the loch whilst the settlement of lies on Loch Maraig, an embayment on the western side of Loch Seaforth. Further settlement is found around the small bays at opposite Seaforth Island which sits in the midst of the loch at the p