Loch Fyne is a sea loch (a salt water lake) on the west coast of Argyll and Bute, Scotland. It extends 40 miles (65 kilometers) inland from the Sound of Bute, making it the longest sea loch in Scotland. The loch is a popular body of water for sport diving, boating, and fishing and is also well known for its oysters. Loch Fyne Oysters and the associated Loch Fyne Restaurant chain, popular throughout the UK, got its start in Lock Fyne. The loch is also a favorite tourist destination with many unique attractions such as Inveraray Castle and the nearby ruins of Castle MacEwan and Castle Lachlan.

Water-related activities on Loch Fyne include fishing, diving and sailing. Loch Fyne is particularly noted for its sea trout fishing. A pier in the town of Inveraray, towards the top of the loch, is a popular spot with sea trout anglers. A jetty in the village of Furnace is a great spot for mackerel and cod. For those who prefer boat fishing, fishing trips and boats for hire are available. Fish in Loch Fyne include cod, pollack, coalfish, conger, plaice, turbot, sea trout, mackerel and ling. Loch Fyne is also a rich feeding ground for herring which once formed vast shoals in its sheltered areas. In the past, herring fishing was the main industry in Inveraray, but in recent decades, the herring population in the loch has dwindled due to overfishing.

Loch Ness, Loch Lomond and Loch Morar are among the largest of Scotland's freshwater lochs, which number around 30,000.

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