Gregório Byington Duvivier (born April 11, 1986) is a Brazilian actor, comedian and poet. He is known by his works in film and theater, being one of the members of the comedian troupe Porta dos Fundos.
Duvivier was born in Rio de Janeiro, the son of musician and visual artist Edgar Duvivier and singer Olivia Byington, and his siblings are John, Theodora and Barbara Duvivier. He is also the nephew of actress Bianca Byington. On his paternal side, he descends from the commander Theodore Duvivier, one of the promoters of the urbanization of the neighborhoods of Copacabana and Leme (Rio de Janeiro), in the late nineteenth century. On his maternal side, the philanthropist Pérola Byington was his great-great-grandmother.
At age 9, he studied acting at Tablado school. One year before entering college, Duvivier joined Marcelo Adnet, Fernando Caruso and Marcelo Queiroga in the comedy show Z.É.- Zenas Emprovisadas. He graduated in Literature at Pontifícia Universidade Católica do Rio de Janeiro.