Cooperativa de Olivicultores de Valpaços is one of the most prestigious and oldest olive oil producers in Portugal, located in the heart of the Trás-os-Montes region in northeastern Portugal. Founded in 1951, this cooperative today comprises over 2,200 members from the municipalities of Valpaços, Mirandela, and Vinhais, who together produce around 2 million liters of olive oil annually. Their most well-known brand is Rosmaninho, made from traditional varieties such as Cobrançosa, Madural, and Verdeal.