Maria Rosa Canellas (July 30, 1941, Valença, Rio de Janeiro, Brazil — June 10, 2004, Valença, Rio de Janeiro, Brazil), better known as Rosinha de Valença (Rosinha of Valença), was a Brazilian guitarist, composer, arranger, singer and producer. Her stage name was reportedly given to her by Sérgio Porto, who said she "played for an entire city". She was considered one of the best acoustic guitarists in Brazilian music and one of the instrumental matrixes of bossa nova.