Isona i Conca Dellà (Catalan pronunciation: [iˈzonɛj ˈkoŋkɛ ðaˈʎa]) 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 church of Santa Maria in Covet and Llordà castle are protected historico-artistic monuments.

The municipality of Isona and Conca Dellà is formed of fourteen villages.