Severino (Sivuca) Dias de Oliveira (26 March 1930, Itabaiana, Brazil – 14 December 2006, João Pessoa, Paraíba, Brazil) was a Brazilian accordionist and guitarist. In addition to in his home state of Paraíba, in Recife, and in Rio de Janeiro, he worked and lived in Paris, Lisbon, and New York on and off throughout his life.

He is best known internationally for his work with Scandinavian jazz musicians in the 1980s. His most famous songs are the Brazilian popular classic João e Maria with lyrics by Chico Buarque and the accordion standard Feira de Mangaio. He is famous for his use of makeshift instruments playing alongside conventional ones and for his versatility, fusing traditional regional styles such as forró and Chorinho with jazz, bossa, classical, and other musical forms.