Tarbet is a small village in Argyll and Bute, Scotland, located within the Loch Lomond and The Trossachs National Park. Traditionally on the northern fringes of the historic County of Dunbartonshire, it is on the banks of Loch Lomond, and has a pier. It stands on an isthmus where Loch Long and Loch Lomond come close. The village of Arrochar stands at the head of Loch Long, at the other side of the isthmus.