|Location||Argyll and Bute, Scotland.|
|Coordinates||Coordinates: , grid reference|
|Type||Freshwater Loch and Reservoir.|
|Basin countries||Scotland, United Kingdom.|
|Max. length||2,285 feet (696 m)|
|Max. width||1,235 feet (376 m)|
|Surface area||250,000 m2 (2,700,000 sq ft)|
|Water volume||450,000 m3 (360 acre⋅ft)|
Asgog Loch is a natural freshwater loch in Argyll and Bute, Scotland. It is located about 4 kilometres (2.5 mi) southwest of Tighnabruaich, on the Cowal peninsula. The loch was dammed during the 19th century to create an impounding reservoir for the supply of freshwater to the Low Mills of the nearby gunpowder mills at Millhouse (the Kames Powder Works).
Asgog Castle, situated on the northwest shore of the loch, was once the home of a cadet branch of Clan Lamont. It was first recorded in 1581, but may be mid-15th-century in date. In 1646, the castle was besieged and eventually destroyed by Clan Campbell, during the conflict now known as the Dunoon massacre. Only three walls of the keep are now standing; of the courtyard, there are no identifiable remains.
- "Argyll and Bute Council Reservoirs Act 1975 Public Register"
- Argyll: An Inventory of the Monuments: Volume 7: Mid Argyll & Cowal. Royal Commission on the Ancient and Historical Monuments of Scotland. 1992. p. 494. ISBN 0-11-494094-0.
- RCAHMS, pp. 23, 538 (n. 65)
- Munro, Robert (1892–93). "Notes of Crannogs or Lake Dwellings recently discovered in Argyllshire". Proceedings of the Society of Antiquaries of Scotland. 27: 210–211.
- RCAHMS, p. 212–213
- Coventry, Martin (1997). The Castles of Scotland (2nd ed.). Goblinshead. p. 58. ISBN 1-899874-10-0.
- for Asgog Loch
- Media related to Asgog Loch at Wikimedia Commons
- Media related to Asgog Castle at Wikimedia Commons