Isona i Conca Dellà is a municipality in the comarca of the Pallars Jussà in Catalonia, Spain. It is situated in the valley of the Conques river in the south-east of the comarca. It was formed in 1970 by the fusion of the following municipalities: Isona, Basturs, Benavent de la Conca, Biscarri, Conques, Covet, Gramenet, Llordà, Masos de Sant Martí, Montodó, Orcau i Figuerola d'Orcau, Sant Romà d'Abella and Siall. The town hall is in Isona. The municipality is served by the C-1412 road between Artesa de Segre and Tremp, and is linked to Coll de Nargó by the L-511. It includes a small exclave to the south.
The church of Santa Maria in Covet and Llordà castle are protected historico-artistic monuments.