Llandinam is a village and community in Montgomeryshire, Powys, central Wales, between Newtown and Llanidloes, located on the A470. As a community, Llandinam is made up of the village itself, small hamlets including Plas Dinam and Little London and several farms. The village itself has a population of around 576 with 56% born in Wales.

The A470 is a trunk road in Wales. It is the country's longest road at 186 miles (299 km) and links the capital Cardiff on the south coast to Llandudno on the north coast. While previously one had to navigate the narrow roads of Llanidloes and Dolgellau, both these market towns are now bypassed due to extensive road modernisation. The 26 miles (42 km) from Cardiff Bay to Merthyr Tydfil are mainly dual carriageway, but most of the route from north of Merthyr to Llandudno is single carriageway.