Llanfrynach is a village and community in the county of Powys, Wales. It lies just to the southeast of Brecon in the Brecon Beacons National Park. The village sits astride the Nant Menasgin, a right bank tributary of the River Usk. The B4558 passes just to its north and the Monmouthshire and Brecon Canal also passes around the village. The Welsh name signifies the 'church of Brynach'. 
The Cefn Brynich Canal Bridge Aqueduct over the Usk is a Grade II* listed structure.
- Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'
- Owen, H.W. & Morgan, R. 2007 'Dictionary of the Place-names of Wales' Gomer Press, Ceredigion
- "The Cefn Brynich Canal Bridge Aqueduct, Llanfrynach". British Listed Buildings. Retrieved 14 December 2013.
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