|Location||Lochaber, Highland, Scotland|
|Primary inflows||River Arkaig|
|Primary outflows||River Lochy|
|Basin countries||United Kingdom|
|Max. length||16 km (9.9 mi)|
|Surface area||16 km2 (6.2 sq mi)|
|Average depth||70 m (230 ft)|
|Max. depth||162 m (531 ft)|
|Water volume||1.1 km3 (0.26 cu mi)|
|Surface elevation||94 ft (29 m)|
|Settlements||Close to Nevis range mountains experience 0.7 km|
Located 16 km (10 mi) southwest of Loch Ness along the Great Glen, the loch is over 15 km (9 mi) long with an average width of about 1 km (5⁄8 mi). The River Lochy flows from its southwestern end while the Caledonian Canal links its northeastern extent to Loch Oich.
The Stand-off at the Fords of Arkaig in September 1665 ended a 360-year feud between the Camerons and the Chattan Confederation. It took place at Achnacarry, on the isthmus between Loch Lochy and Loch Arkaig.
Folklore tales mention a supernatural being called the River Horse which was said to emerge from the lake and assume a horse's shape before feeding on the loch's banks. The River Horse was also known as the Lord of the Lake and the Water King and would overturn boats and "entice mares from their pastures". Another tradition was that of the River Bull, "a gentle, harmless creature", who would "emerge from the lake into the pasture of cows".
- John, Murray; Lawrence, Pullar. Bathymetrical Survey of the Fresh-Water Lochs of Scotland, 1897–1909 Lochs of the Polly Basin Volume II – Loch Lurgainn. p. 356. Retrieved 15 November 2022. This article incorporates text from this source, which is in the public domain.
- "Loch Lochy". Centre for Ecology and Hydrology. Scotland and Northern Ireland Forum for Environmental Research (SNIFFER). Retrieved 15 November 2022.
- Gittings, Bruce; Munro, David. "Loch Lochy". The Gazetteer for Scotland. School of GeoSciences, University of Edinburgh and The Royal Scottish Geographical Society. Retrieved 15 November 2022.
- Appleton's European guide book for English-speaking travellers, Volume 1 page 92 (1886)
- "PECULIAR SUPERSTITIONS". The Queenslander. 3 January 1925. p. 36. Retrieved 16 September 2013 – via National Library of Australia.