Glyn
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Glyn [ˈɡlɪn] means "Valley" in Welsh and may refer to:
- Glyn (name), including a list of people with the name
 - Baron Glyn, a title in the Peerage of the United Kingdom
 - Glyn baronets, created for members of the Glyn family
 - Glyn Ceiriog, a former slate mining village in Wrexham County Borough, in Wales
 - Glyn Technology School, an English boys' school in Epsom and Ewell
 - Glyn Valley Tramway, a narrow gauge railway between Chirk and Glyn Ceiriog in Denbighshire, Wales
 - Mynydd y Glyn, a mountain in South Wales, between the towns of Pontypridd and Tonyrefail
 - An electoral ward in the community of Llanelli Rural in Carmarthenshire, Wales
 - An electoral ward in the community of Colwyn Bay in Conwy, Wales