Loch Dubh ("Black Loch") is a lochan on the Duchray Water in the western part of Loch Ard Forest in the Central Highlands of Scotland.
Loch Dubh nestles in a wooded valley called Gleann Dubh at a height of about 140 metres above sea level. It is 4 kilometres east of Scotland's most popular Munro, Ben Lomond (974 m), one kilometre south of Beinn Dubh (508 m), 1ý kilometres northeast of Beinn Bahn (569 m) and five kilometres west northwest of Kinlochard near the head of Loch Ard.