Loch Fada (English: Long Lake) is a loch located on the Inner Hebridean island of Colonsay, Scotland.

It extends between Kiloran and Lower Kilchattan approximately 3 km (1.9 mi) and is the largest loch on Colonsay.

It is located at grid reference NR385955 The loch consists of a string of three lochs and is a Designated Special Area of Conservation (SAC).

The Royal Navy frigate HMS Loch Fada was named after the loch.

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