Saint-Dier-d'Auvergne () is a small village-town in the Puy-de-Dôme department in Auvergne-Rhône-Alpes region in central France. The commune of Saint-Dier-d'Auvergne is part of the canton of Billom and of the arrondissement of Clermont-Ferrand.
The altitude of the commune of Saint-Dier-d'Auvergne ranges between 416 and 700 meters. The area of the commune is 20.15 km<sup>2</sup>. The nearest larger towns are Courpière (10 km to the northeast) and Billom (12 km to the northwest).
As of 2023, the population of the commune was 556. As of 2019, there were 416 dwellings in the commune, of which 265 primary residences.