La Baronia de Rialb (Catalan pronunciation: [la βaɾoˈnia ðe riˈalp]) is a municipality in the comarca (county) of the Noguera in Catalonia, Spain. The territory is crossed by the river Rialb and the river Segre. The capital city is Gualter; before it had been La Torre de Rialb.

The municipality is formed by the union of old and tiny hamlets and parishes, which in total accounts for twenty-three Romanesque churches, which is the largest number of such churches in Catalonia.

The agricultural sector is still what draws the most numbers of jobs in La Baronia. A country with blueprints^{[clarification needed]} irrigated, highly arable lands, with a level of approximately 400 m to over 800 m altitude of usable land is suitable for a wide variety of crops. However, since a few years ago, the tourism sector is becoming the economic boost that the valley needed. In fact, there are currently available a two dozen agritourist establishments.

• Rialb reservoir – the biggest dam in Catalonia.
• Forat de Bulí – a unique ravine in the river Rialb. It is suitable for extreme sports like canyoning.
• Alzinera de Cal Penjat – a hundred-year-old oak in El Puig de Rialb.
• GR 1 – a long-distance footpath that crosses the north of La Baronia.
• Pallerols-Andorra Way – a route suitable for hiking that starts in La Baronia and finishes in Andorra.

• Santa Maria de Gualter – a former Benedictine monastery in Gualter.
• Santa Maria de Palau de Rialb – a Romanesque church built between the 11th and 13th centuries.
• Dolmen of Sols de Riu – a megalithic tomb located near the Rialb reservoir, in La Torre de Rialb.

• (in Catalan) Official website
• Information - Consorci del Montsec
• Information - Tourism Lleida
• Government data pages (in Catalan)