Llangynog (grid reference ) is a village and community which lies at the confluence of the Afon Eirth and the Afon Tanat at the foot of the Berwyn range in north Powys (previously Montgomeryshire), Wales.
It lies at the foot of the Milltir Cerrig mountain pass on the B4391 road, which runs between Llan Ffestiniog and Llanfyllin (though the B4391 road number 'disappears' between the western end of Llyn Celyn and Bala).
It was the western terminus of the Tanat Valley Light Railway (Llynclys - Llangynog) (15 miles); it opened on 5 January 1904 and closed (passenger traffic) in 1951.
It is close to the pilgrimage shrine of Saint Melangell at the church of Pennant Melangell (grid reference ). Lake Vyrnwy is a short drive away. Bala Lake, Powys Castle in Welshpool and Oswestry take around half an hour by car. Wrexham, Chester, New Town and Shrewsbury are all under an hour away. The seaside town of Barmouth is also within easy reach by car.
- "Area: Llangynog (Parish)". Office for National Statistics. 30 January 2013. Retrieved 12 August 2015.
- "Area: Llangynog (Parish)". Office for National Statistics. 18 November 2004. Retrieved 12 August 2015.
- "2011 Census results by Community". Welsh Language Commissioner. 2015. Retrieved 12 August 2015.[permanent dead link]