Valls is a city and municipality in the Camp de Tarragona region in Catalonia, Spain. It is the capital of the comarca of Alt Camp, and according to the 2014 census it has a population of 24,570. Valls is known for its calçots – a type of scallion or green onion – and the human towers tradition known as the castells. The town is the birthplace of the composer Robert Gerhard.