Severino Dias de Oliveira (May 26, 1930 – December 14, 2006), known professionally as Sivuca, was a Brazilian accordionist, guitarist and singer.

His most famous songs are "João e Maria" with lyrics by Chico Buarque and "Feira de Mangaio", named after the artisan markets of northeast Brazil.

He used makeshift instruments alongside conventional ones and combined traditional regional styles such as forró and choro with jazz, bossa nova, and classical music.

His professional career began in Pernambuco where he went at the age of 15, and continued in his first album with Humberto Teixeira (1950), leading to work in radio and television in Rio de Janeiro from 1955.

He also collaborated with the husband-and-wife team of Oscar Brown and Jean Pace on Joy, an off-Broadway musical show that was performed at the New Theatre in 1970,[1] and the production's original cast recording which was released by RCA Victor that same year.