Glen Auldyn

{{Short description|Valley and village on the Isle of Man}}

{{Use dmy dates|date=April 2022}}

File:Glen Auldyn in the spring - geograph.org.uk - 452616.jpg

Glen Auldyn is a narrow valley about {{convert|6|km}} long on the Isle of Man, with a river of the same name. This flows in a NNE direction and flows into the River Sulby not far from its estuary, near Ramsey. It is entirely within the parish of Lezayre. The lower one-third of the valley is inhabited and is partly followed by the B16 road. This section is overlooked by Sky Hill.

The middle section of the valley contains a ribbon of mature oak woodland.[http://www.manxwt.org.uk/sites/default/files/files/wfom_oakhazel_woodlands_inventory%203.pdf Manx Wildlife Trust]

File:Glen Auldyn.jpg

The valley contains the small church of St Fingan.{{Cite web |url=http://www.bbc.co.uk/history/domesday/dblock/GB-242000-491000/page/10 |title=BBC: Domesday Reloaded |access-date=2012-01-29 |archive-date=2012-01-29 |archive-url=http://webarchive.nationalarchives.gov.uk/20120129205946/http://www.bbc.co.uk/history/domesday/dblock/GB-242000-491000/page/10 |url-status=live }}

File:Glen Auldyn Chapel - geograph.org.uk - 452606.jpg

In the valley is an underground reservoir with a capacity of around {{convert|6800|m³}} which supplies the north and east of the island.[https://www.bbc.co.uk/news/world-europe-isle-of-man-18782854 BBC: Opening of reservoir]

In May 2025, Manx Wildlife Trust announced that they had purchased 455 hectares (1124 acres) of land in the upper parts of Glen Auldyn, including the moorland to the west, to create a new nature reserve where temperate rainforest will be restored. This forms Manx Wildlife Trust's 32nd and largest Manx nature reserve.https://www.mwt.im/news/major-rainforest-restoration-project-launches-isle-manhttps://www.mwt.im/nature-reserves/glen-auldyn