Samuel Rosa de Alvarenga (born July 15, 1966) is the former lead singer, primary composer and guitarist of Brazilian rock band Skank. He has a psychology degree from Universidade Federal de Minas Gerais.
Samuel writes the music for most of the group's songs, with 80% of the lyrics by Chico Amaral. Other songwriting partners were Nando Reis, Arnaldo Antunes, and Lô Borges.
Samuel is a football fan and supports Cruzeiro.
His album Rosa was included in the list of 50 best albums of 2024 by the São Paulo Art Critics Association.