Glyntawe is a hamlet and parish on the upper reaches of the River Tawe in Powys, Wales, in the community of Tawe-Uchaf.

It is situated at the south-western extremity of the extensive parish of Devynock, in a vale between elevated and dreary mountains, not far from the source of the river Tawe.

"[1] Theophilus Jones in 1809 wrote of Devynock parish that, The third chapel in this parish, in the vale of Tawe, is sometimes called Cael Glyntawe and sometimes Capel Callwen, a corruption of Cellwen, Fairwood chapel, or the chapel in the fair wood, descriptive no doubt of its early appearance; but so rude has been the hand of time and the equally denuding industry of man, so changed are the habiliments of nature in the course of ages, that she has here been disrobed of her verdant livery, which has been succeeded by a comfortless and slight russet mantle, incumbered by large stones and pebbles, and where the oak formerly grew in luxuriancy, the lichen at present barely vegetates.

"[2] A prehistoric site at Waun Fignen Felen, Glyntawe, has been carefully studied by paleo-ecologists and archaeologists.

[8] The Imperial Gazetteer of England and Wales (1870–72) described Glyntawe as "a hamlet-chapelry in Devynnock parish, Breconshire; 7½ miles W of Brecon town and r. station.

"[9] On 1 July 1893 a new Church of Saint Callewn was substituted for the older building in the parish of Glyntawe by Basil Jones, bishop of St David's.

[12] Also called the Dulwich College Field Centre, this is a hostel that can sleep up to 40 people, and makes a base for outdoor activities such as hiking, mountain biking, caving or fishing.

[13] Glyntawe contains the National Showcaves of Wales at Dan yr Ogof, a major tourist attraction.