Loch Fyne (, ), meaning Loch of the Vine or Wine, is a sea loch on the west coast of Argyll and Bute, Scotland. It extends inland from the Sound of Bute, making it the longest of the sea lochs. It is connected to the Sound of Jura by the Crinan Canal. Although there is no evidence that grapes have grown there, the title is probably honorific, indicating that the river, " Fìne", was a well-respected river.