Llandinam (Welsh pronunciationⓘ) is a village and community in Montgomeryshire, Powys, central Wales, between Newtown and Llanidloes, located on the A470.

[2] As a community, Llandinam is made up of the village itself, small hamlets including Plas Dinam and Little London and several farms.

[3] Llandinam was the family home of David Davies (1818–1890) who was responsible for much of the development of the South Wales Valleys and the export of coal in the 19th century.

The parents of Murray Humphreys (1899–1965), one of Chicago's most feared Prohibition gangsters, emigrated to the United States from the village in the late 1890s.

[7] St Llonio's Church is located north of the village, on a spur of land jutting into the Severn Valley, and within a fortified promontory fort.

[15] The house that David Davies built, Broneirion, remains an elegant country mansion owned by Girlguiding Cymru.