La Baronia de Rialb () 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.
It has a population of .
The agricultural sector is still what draws the most numbers of jobs in La Baronia. A country with blueprints 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.