Gregynog (Welsh pronunciation: [ɡrɛˈɡənɔɡ]) is a large country mansion in the village of Tregynon, 4 miles (6 km) northwest of Newtown in the old county of Montgomeryshire, now Powys in mid Wales. There has been a settlement on the site since the twelfth century. From the fifteenth to the nineteenth centuries it was the home of the Blayney and Hanbury-Tracy families.